diff --git a/kattis/progressivescramble/solution.py b/kattis/progressivescramble/solution.py
new file mode 100644
index 0000000..b35618c
--- /dev/null
+++ b/kattis/progressivescramble/solution.py
@@ -0,0 +1,49 @@
+def encrypt(s):
+    t = []
+    for c in s:
+        a = 0
+        if c != ' ':
+            a = ord(c) - ord('a') + 1
+        if len(t):
+            t.append(t[-1] + a)
+        else:
+            t.append(a)
+
+    u = []
+    for c in t:
+        c %= 27
+        if c == 0:
+            u.append(' ')
+        else:
+            u.append(chr(c + ord('a') - 1))
+    return ''.join(u)
+
+def decrypt(s):
+    t = []
+    tmp = 0
+    for c in s:
+        a = 0
+        if c != ' ':
+            a = ord(c) - ord('a') + 1
+        a -= tmp
+        while a < 0:
+            a += 27
+        tmp += a
+        t.append(a)
+    u = []
+    for c in t:
+        if c == 0:
+            u.append(' ')
+        else:
+            u.append(chr(c + ord('a') - 1))
+    return ''.join(u)
+
+t = int(input())
+for _ in range(t):
+    s = input()
+    op = s[0]
+    s = s[2:]
+    if op == 'e':
+        print(encrypt(s))
+    else:
+        print(decrypt(s))