diff --git a/977.py b/977.py
new file mode 100644
index 0000000..4d9fa55
--- /dev/null
+++ b/977.py
@@ -0,0 +1,28 @@
+# https://leetcode.com/problems/squares-of-a-sorted-array/
+
+from typing import List
+import unittest
+
+
+class Solution:
+    def sortedSquares(self, nums: List[int]) -> List[int]:
+        return sorted([n**2 for n in nums])
+
+
+class Test(unittest.TestCase):
+    def setUp(self):
+        self.solution = Solution()
+
+    def test_first(self):
+        self.assertEqual(
+            self.solution.sortedSquares(nums=[-4, -1, 0, 3, 10]), [0, 1, 9, 16, 100]
+        )
+
+    def test_second(self):
+        self.assertEqual(
+            self.solution.sortedSquares(nums=[-7, -3, 2, 3, 11]), [4, 9, 9, 49, 121]
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/README.md b/README.md
index c7b3f8c..8e67dc8 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 | Problem Number | Tag                    | URL                                                                        |
 | -------------- | ---------------------- | -------------------------------------------------------------------------- |
 | 1.py           | Hash table             | https://leetcode.com/problems/two-sum/                                     |
+| 977.py         | Sorting                | https://leetcode.com/problems/squares-of-a-sorted-array/                   |
 | 1051.py        |                        |                                                                            |
 | 1207.py        |                        |                                                                            |
 | 1337.py        | Heap                   | https://leetcode.com/problems/the-k-weakest-rows-in-a-matrix               |