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.
import sys
import math

S = raw_input()

for x in S:
    if "a" <= x <= "z":
        sys.stdout.write(x.upper())
    elif "A" <= x <= "Z":
        sys.stdout.write(x.lower())
    else:
        sys.stdout.write(x)
print