diff --git a/elements/6_4_Replace_Remove/solution.py b/elements/6_4_Replace_Remove/solution.py
new file mode 100644
index 0000000..9419866
--- /dev/null
+++ b/elements/6_4_Replace_Remove/solution.py
@@ -0,0 +1,22 @@
+# Question: Replace a by two d's and remove b's
+
+
+def replaceAndRemove(arr):
+    n = len(arr)
+    i = 0
+    while i < n:
+        if arr[i] == "b":
+            del arr[i]
+            i -= 1
+            n -= 1
+        elif arr[i] == "a":
+            del arr[i]
+            arr.append("d")
+            arr.append("d")
+            i -= 1
+            n += 1
+        i += 1
+    return arr
+
+
+print("Replace: " + str(replaceAndRemove(["a", "b", "c", "v"])))