diff --git a/medium/find_unique_binary_string.py b/medium/find_unique_binary_string.py
new file mode 100644
index 0000000..5009444
--- /dev/null
+++ b/medium/find_unique_binary_string.py
@@ -0,0 +1,17 @@
+# https://leetcode.com/problems/find-unique-binary-string
+
+from typing import List
+
+class Solution:
+    def findDifferentBinaryString(self, nums: List[str]) -> str:
+        length = len(nums)
+        kv = {num: True for num in nums}
+        result = ''
+        fmt = '0' + str(length) + 'b'
+        max = 2 ** length
+        for i in range(max):
+            result = format(i, fmt)
+            if result not in kv:
+                break
+        return result
+