def encrypt(text, n):
count = 0
while count != n:
text = text[1::2] + text[::2]
count += 1
return text
s = "This is a test!"
print encrypt(s, 0) == s
ZGVmIGVuY3J5cHQodGV4dCwgbik6CiAgICBjb3VudCA9IDAKCiAgICB3aGlsZSBjb3VudCAhPSBuOgogICAgICAgIHRleHQgPSB0ZXh0WzE6OjJdICsgdGV4dFs6OjJdCiAgICAgICAgY291bnQgKz0gMQoKICAgIHJldHVybiB0ZXh0CgpzID0gIlRoaXMgaXMgYSB0ZXN0ISIKcHJpbnQgZW5jcnlwdChzLCAwKSA9PSBz