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.
st = raw_input()
ans = ''
for ch in st:
    if ch.islower():
        ans += ch.upper()
    elif ch.isupper():
        ans += ch.lower()
    else:
        ans += ch
print ans