import re, sys

def change_chars_in_string(string:str, new_chars:str, index:int) -> str:
    new_chars_size = len(new_chars)
    return string[:index] + new_chars + string[index+new_chars_size:]

def zad_01(line:str) -> str:
    uppercase_pattern = "[A-ZĄĆĘŁŃÓŚŹŻ]"
    lowercase_pattern = "[a-ząćęłńóśźż]"
    matches = re.finditer('\w+',line)
    for match in matches:
        match_word = match.group()
        if re.search(uppercase_pattern,match_word) and re.search(lowercase_pattern,match_word):
            new_word = ""
            for m in match_word:
                if re.search(uppercase_pattern,m):
                    new_word += m.lower()
                elif re.search(lowercase_pattern,m):
                    new_word += m.upper()
            line = change_chars_in_string(line,new_word,match.start())
    return line




for line in sys.stdin:
    line = line.rstrip("\n")
    line = zad_01(line)
    print(line)