import sys
import re


def replaceLetter(words):
    result = ''
    for i in words.group(0):
        if re.search(r'[a-ząćęłńóśźż]', i):
            result += i.upper()
        elif re.search(r'[A-ZĄĆĘŁŃÓŚŹŻ]', i):
            result += i.lower()
        else:
            result += i
    return result


for line in sys.stdin:
    searchRe = re.sub(r'[a-ząćęłńóśźż]+\w*[A-ZĄĆĘŁŃÓŚŹŻ]+\w*|[A-ZĄĆĘŁŃÓŚŹŻ]+\w*[a-ząćęłńóśźż]+\w*', replaceLetter, line)
    print(searchRe, end='')