diff --git a/easy/maximum_difference_by_remapping_a_digit.py b/easy/maximum_difference_by_remapping_a_digit.py
new file mode 100644
index 0000000..de7cc57
--- /dev/null
+++ b/easy/maximum_difference_by_remapping_a_digit.py
@@ -0,0 +1,24 @@
+# https://leetcode.com/problems/maximum-difference-by-remapping-a-digit
+
+from typing import List, Optional
+
+class Solution:
+    def minMaxDifference(self, num: int) -> int:
+        n: List[str] = list(str(num))
+        max_num: List[str] = []
+        min_num: List[str] = []
+        max_target: Optional[str] = None
+        min_target: str = n[0]
+        for i in range(len(n)):
+            if n[i] == min_target:
+                min_num.append('0')
+            else:
+                min_num.append(n[i])
+            if max_target is None and n[i] != '9':
+                max_target = n[i]
+            if max_target == n[i]:
+                max_num.append('9')
+            else:
+                max_num.append(n[i])
+        return int(''.join(max_num)) - int(''.join(min_num))
+