diff --git a/src/my_project/interviews/top_150_questions_round_20/valid_parentheses.py b/src/my_project/interviews/top_150_questions_round_20/valid_parentheses.py
new file mode 100644
index 00000000..f28aa882
--- /dev/null
+++ b/src/my_project/interviews/top_150_questions_round_20/valid_parentheses.py
@@ -0,0 +1,20 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def isValid(self, s):
+
+        dic_parentheses = {'(':')','[':']','{':'}'}
+
+        check_list = list()
+
+        for p in s:
+
+            if p in dic_parentheses:
+                check_list.append(p)
+            else: 
+                if len(check_list) == 0 or \
+                        dic_parentheses[check_list.pop()] != p:
+                    return False 
+                
+        return len(check_list) == 0
\ No newline at end of file
diff --git a/tests/test_150_questions_round_20/test_valid_parentheses_round_20.py b/tests/test_150_questions_round_20/test_valid_parentheses_round_20.py
new file mode 100644
index 00000000..46c25092
--- /dev/null
+++ b/tests/test_150_questions_round_20/test_valid_parentheses_round_20.py
@@ -0,0 +1,20 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_20\
+.valid_parentheses import Solution
+
+class ValidParenthesesTestCase(unittest.TestCase):
+
+    def test_is_valid_parentheses(self):
+        solution = Solution()
+        output = solution.isValid(s='()')
+        self.assertTrue(output)
+
+    def test_is_no_valid_parentheses_pattern_1(self):
+        solution = Solution()
+        output = solution.isValid(s='(]')
+        self.assertFalse(output)
+
+    def test_is_no_valid_parentheses_pattern_2(self):
+        solution = Solution()
+        output = solution.isValid(s='((')
+        self.assertFalse(output)
\ No newline at end of file