Write a program which converts uppercase/lowercase letters to lowercase/uppercase for a given string.

Constraints

* The length of the input string < 1200

Input

A string is given in a line.

Output

Print the converted string in a line. Note that you do not need to convert any characters other than alphabetical letters.

Example

Input

fAIR, LATER, OCCASIONALLY CLOUDY.


Output

Fair, later, occasionally cloudy.
s = raw_input()
r = ''
for c in s:
    d = c
    if c >= 'a' and c <= 'z':
        d = chr(ord(c) - ord('a') + ord('A'))
    if c >= 'A' and c <= 'Z':
        d = chr(ord(c) - ord('A') + ord('a'))
    r = r + d
print r