diff --git a/src/main/kotlin/SMNP.kt b/src/main/kotlin/SMNP.kt
index b43e3ec..c435514 100644
--- a/src/main/kotlin/SMNP.kt
+++ b/src/main/kotlin/SMNP.kt
@@ -2,5 +2,5 @@ import interpreter.Interpreter
 
 fun main(args: Array<String>) {
     val interpreter = Interpreter()
-    interpreter.run("true 123 \"fsfsef\" @c:14 3.14")
+    interpreter.run("true 123 -\"fsfsef\".13.15 @c:14 3.14")
 }
\ No newline at end of file
diff --git a/src/main/kotlin/dsl/ast/model/node/AccessOperatorNode.kt b/src/main/kotlin/dsl/ast/model/node/AccessOperatorNode.kt
index b6a51bf..0175781 100644
--- a/src/main/kotlin/dsl/ast/model/node/AccessOperatorNode.kt
+++ b/src/main/kotlin/dsl/ast/model/node/AccessOperatorNode.kt
@@ -1,5 +1,3 @@
 package dsl.ast.model.node
 
-import dsl.token.model.entity.TokenPosition
-
-class AccessOperatorNode(position: TokenPosition) : BinaryOperatorAbstractNode(position)
\ No newline at end of file
+class AccessOperatorNode(lhs: Node, operator: Node, rhs: Node) : BinaryOperatorAbstractNode(lhs, operator, rhs)
\ No newline at end of file
diff --git a/src/main/kotlin/dsl/ast/model/node/BinaryOperatorAbstractNode.kt b/src/main/kotlin/dsl/ast/model/node/BinaryOperatorAbstractNode.kt
index 5bc8ade..d99cf4c 100644
--- a/src/main/kotlin/dsl/ast/model/node/BinaryOperatorAbstractNode.kt
+++ b/src/main/kotlin/dsl/ast/model/node/BinaryOperatorAbstractNode.kt
@@ -1,23 +1,18 @@
 package dsl.ast.model.node
 
-import dsl.token.model.entity.TokenPosition
-
-abstract class BinaryOperatorAbstractNode(position: TokenPosition) : Node(3, position) {
-    var lhs: Any
+abstract class BinaryOperatorAbstractNode(lhs: Node, operator: Node, rhs: Node) : Node(3, operator.position) {
+    val lhs: Any
     get() = children[0]
-    set(value) {
-        children[0] = value
-    }
 
-    var operator: Any
+    val operator: Any
     get() = children[1]
-    set(value) {
-        children[1] = value
-    }
 
-    var rhs: Any
+    val rhs: Any
     get() = children[2]
-    set(value) {
-        children[2] = value
+
+    init {
+        children[0] = lhs
+        children[1] = operator
+        children[2] = rhs
     }
 }
\ No newline at end of file
diff --git a/src/main/kotlin/dsl/ast/model/node/MinusOperatorNode.kt b/src/main/kotlin/dsl/ast/model/node/MinusOperatorNode.kt
index f89a37e..573010d 100644
--- a/src/main/kotlin/dsl/ast/model/node/MinusOperatorNode.kt
+++ b/src/main/kotlin/dsl/ast/model/node/MinusOperatorNode.kt
@@ -1,5 +1,3 @@
 package dsl.ast.model.node
 
-import dsl.token.model.entity.TokenPosition
-
-class MinusOperatorNode(position: TokenPosition) : UnaryOperatorAbstractNode(position)
\ No newline at end of file
+class MinusOperatorNode(operator: Node, operand: Node) : UnaryOperatorAbstractNode(operator, operand)
\ No newline at end of file
diff --git a/src/main/kotlin/dsl/ast/model/node/UnaryOperatorAbstractNode.kt b/src/main/kotlin/dsl/ast/model/node/UnaryOperatorAbstractNode.kt
index 90bcd48..327afe0 100644
--- a/src/main/kotlin/dsl/ast/model/node/UnaryOperatorAbstractNode.kt
+++ b/src/main/kotlin/dsl/ast/model/node/UnaryOperatorAbstractNode.kt
@@ -1,17 +1,14 @@
 package dsl.ast.model.node
 
-import dsl.token.model.entity.TokenPosition
-
-abstract class UnaryOperatorAbstractNode(position: TokenPosition) : Node(2, position) {
-    var operator: Any
+abstract class UnaryOperatorAbstractNode(operator: Node, operand: Node) : Node(2, operator.position) {
+    val operator: Any
     get() = children[0]
-    set(value) {
-        children[0] = value
-    }
 
-    var value: Any
+    val operand: Any
     get() = children[1]
-    set(_value) {
-        children[1] = _value
+
+    init {
+        children[0] = operator
+        children[1] = operand
     }
 }
\ No newline at end of file
diff --git a/src/main/kotlin/dsl/ast/parser/Parser.kt b/src/main/kotlin/dsl/ast/parser/Parser.kt
index 6501090..623ca0b 100644
--- a/src/main/kotlin/dsl/ast/parser/Parser.kt
+++ b/src/main/kotlin/dsl/ast/parser/Parser.kt
@@ -65,7 +65,7 @@ abstract class Parser {
         }
 
         // allOf -> a b c ...
-        fun allOf(parsers: List<Parser>, createNode: (List<Node>, TokenPosition) -> Node): Parser {
+        fun allOf(parsers: List<Parser>, createNode: (List<Node>) -> Node): Parser {
             return object : Parser() {
                 override fun tryToParse(input: TokenList): ParserOutput {
                     if(parsers.isEmpty()) {
@@ -84,7 +84,7 @@ abstract class Parser {
                         nodes += output.node
                     }
 
-                    return ParserOutput.ok(createNode(nodes, nodes.first().position))
+                    return ParserOutput.ok(createNode(nodes))
                 }
 
             }
diff --git a/src/main/kotlin/dsl/ast/parser/UnitParser.kt b/src/main/kotlin/dsl/ast/parser/UnitParser.kt
new file mode 100644
index 0000000..554eaea
--- /dev/null
+++ b/src/main/kotlin/dsl/ast/parser/UnitParser.kt
@@ -0,0 +1,29 @@
+package dsl.ast.parser
+
+import dsl.ast.model.entity.ParserOutput
+import dsl.ast.model.node.AccessOperatorNode
+import dsl.ast.model.node.MinusOperatorNode
+import dsl.token.model.entity.TokenList
+import dsl.token.model.enumeration.TokenType
+
+class UnitParser : Parser() {
+    override fun tryToParse(input: TokenList): ParserOutput {
+        val minusOperatorParser = allOf(
+            listOf(
+                terminal(TokenType.MINUS),
+                assert(AtomParser(), "atom")
+            )
+        ) {
+            MinusOperatorNode(it[0], it[1])
+        }
+
+        val atom2 = oneOf(listOf(
+            minusOperatorParser,
+            AtomParser()
+        ))
+
+        return leftAssociativeOperator(atom2, listOf(TokenType.DOT), assert(atom2, "atom")) {
+            lhs, operator, rhs -> AccessOperatorNode(lhs, operator, rhs)
+        }.parse(input)
+    }
+}
\ No newline at end of file