diff --git a/.gitignore b/.gitignore
index 92cd3f7..a901a34 100644
--- a/.gitignore
+++ b/.gitignore
@@ -89,5 +89,3 @@ ENV/
 
 # Rope project settings
 .ropeproject
-
-bin/
diff --git a/README.md b/README.md
index 82dbc43..bdb62cd 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-Repo containing my solutions from Code War katas.
+Repo containing my solutions from Code Katas.
 
 ###8kyu
 
@@ -140,4 +140,15 @@ def find_it(xs):
 ```
 def countBits(n):
   return bin(n).count("1")
-```
\ No newline at end of file
+```
+
+
+###Other
+
+
+####Interview Challenge: Proper Parenthetics
+- Module: proper-parenthetics.py
+- TESTS: test_proper-parenthetics.py
+- LINKS: None.
+- DERIVED FROM: [data-structures repo. Specifically stack branch](https://github.com/ellezv/data_structures/tree/stack), collaborated with Maelle Vance.
+
diff --git a/src/count_bits.py b/src/count_bits.py
index f131316..a58e73f 100644
--- a/src/count_bits.py
+++ b/src/count_bits.py
@@ -1,9 +1,8 @@
-"""Implementation of the Bit Counting Kata."""
+
+"""Implemntation of the Bit Counting Kata."""
 
 
 def count_bits(n):
     """Convert a number to binary and counts the number of 1 bits."""
-    print(n)
     val = bin(n)
-    print(val)
     return val.count("1")
diff --git a/src/parenthetics.py b/src/parenthetics.py
new file mode 100644
index 0000000..d4c4c53
--- /dev/null
+++ b/src/parenthetics.py
@@ -0,0 +1,85 @@
+"""Implementation of the Kata Proper Parenthetics."""
+
+
+def parenthetics(uni_string):
+    """Take unicode string as input and return value."""
+    stack = Stack()
+    charac_array = list(uni_string)
+    for charac in charac_array:
+        if charac == '(':
+            stack.push(charac)
+        elif charac == ')':
+            if stack.size() == 0:
+                return -1
+            else:
+                stack.pop()
+    if stack.size() == 0:
+        return 0
+    elif stack.size() > 0:
+        return 1
+
+
+class Stack(object):
+    """Create stack of parenthetics."""
+
+    def __init__(self):
+        """Create a new stack, from LinkedList using composition."""
+        self._linkedlist = LinkedList()
+
+    def push(self, value):
+        """Push a new value on top of the stack."""
+        self._linkedlist.push(value)
+
+    def size(self):
+        """Return side of a."""
+        return self._linkedlist.size()
+
+    def pop(self):
+        """Pop the first value of the stack."""
+        return self._linkedlist.pop()
+
+
+"""Python implementation of a linked list."""
+
+
+class Node():
+    """Instantiate a Node."""
+
+    def __init__(self, value=None, next=None):
+        """Instantiate a node with value and next params."""
+        self.value = value
+        self.next = next
+
+
+class LinkedList():
+    """Instantiate a Linked List."""
+
+    def __init__(self):
+        """Instantiate an empty Linked list."""
+        self.head = None
+
+    def push(self, val):
+        """Push a new node as the head of the linked list."""
+        new_node = Node(val, self.head)
+        self.head = new_node
+
+    def pop(self):
+        """Pop first value off linked list and return value."""
+        # if self.head is None:
+        if self.head is not None:
+            pop_head = self.head.value
+            self.head = self.head.next
+            return pop_head
+        else:
+            raise IndexError('cannot pop from empty list')
+
+    def size(self):
+        """Return the length of the linked list."""
+        if self.head is not None:
+            size = 1
+            curr = self.head
+            while curr.next is not None:
+                size += 1
+                curr = curr.next
+            return size
+        return 0
diff --git a/src/tests/test_parenthetics.py b/src/tests/test_parenthetics.py
new file mode 100644
index 0000000..ae87c75
--- /dev/null
+++ b/src/tests/test_parenthetics.py
@@ -0,0 +1,28 @@
+"""Tests for parenthetics module."""
+
+
+import pytest
+
+
+PAREN_TABLE = [
+    ['((()))', 0],
+    ['((())', 1],
+    [')))(((', -1]
+]
+
+
+@pytest.mark.parametrize("uni_string, result", PAREN_TABLE)
+def test_parenthetics(uni_string, result):
+    """Test the parenthetics function."""
+    from parenthetics import parenthetics
+    assert parenthetics(uni_string) == result
+
+
+def test_pop_empty():
+    """Test the parenthetics function."""
+    from parenthetics import LinkedList
+    list = LinkedList()
+    try:
+        list.pop()
+    except Exception as e:
+        assert str(e) == 'cannot pop from empty list'