diff --git a/problems/leet_389.py b/problems/leet_389.py
new file mode 100644
index 0000000..98be580
--- /dev/null
+++ b/problems/leet_389.py
@@ -0,0 +1,29 @@
+# https://leetcode.com/problems/find-the-difference/
+# Runtime: 36 ms, faster than 68.64% of Python3 online submissions for Find the Difference.
+
+
+class Solution:
+    def findTheDifference(self, s: str, t: str) -> str:
+        alpha = dict()
+        for each_s in s:
+            if each_s not in alpha:
+                alpha[each_s] = 1
+            else:
+                alpha[each_s]+=1
+        for each_t in t:
+            if each_t in alpha:
+                alpha[each_t] -=1
+            else:
+                alpha[each_t] = 1
+        string=""
+        for key,value in alpha.items():
+            if(value==1 or value==-1):
+                string+=key
+        print(string)
+        return string
+        
+
+s = Solution()
+print(s.findTheDifference("abcd", "abcde"))
+
+