#!/usr/bin/env nix-shell
#! nix-shell -i python3 --pure
#! nix-shell -p python3

import random
import sys

# maj = True

for line in sys.stdin:
    new_line = ""
    for c in line:
        maj = random.random() > 0.5
        if maj:
            nc = c.upper()
        else:
            nc = c.lower()
        new_line += nc
        # maj = not maj
    print(new_line, end="")