diff --git a/medium/remove_all_occurrences_of_a_substring.py b/medium/remove_all_occurrences_of_a_substring.py
new file mode 100644
index 0000000..e2ae1ff
--- /dev/null
+++ b/medium/remove_all_occurrences_of_a_substring.py
@@ -0,0 +1,15 @@
+# https://leetcode.com/problems/remove-all-occurrences-of-a-substring
+
+class Solution:
+    def removeOccurrences(self, s: str, part: str) -> str:
+        result = []
+        def is_part():
+            return "".join(result[-len(part):]) == part
+        for ch in s:
+            result.append(ch)
+            if len(result) >= len(part):
+                if is_part():
+                    for _ in range(len(part)):
+                        result.pop()
+        return "".join(result)
+