import re
import sys


def repl(char):
    x = char.group(0)
    output_str = ""
    for c in x:
        c = c.swapcase()
        output_str += c
    return output_str


pattern = re.compile(r"\b[a-ząćęłńóśźż]+[A-ZĄĆĘŁŃÓŚŹŻ]+\b|\b[A-ZĄĆĘŁŃÓŚŹŻ]+[a-ząćęłńóśźż]+\b")
# f = open("polish_wiki_excerpt.in", "r")


def change_line(word_list, curr_line):
    for word in word_list:
        curr_line = curr_line.replace(word, word.swapcase())

    return curr_line.rstrip('\n')


for line in open("./polish_wiki_excerpt.in", encoding="utf8"):
# for line in sys.stdin:
    found_words = re.findall(pattern, line)
    out = change_line(found_words, line)
    if out:
        print(out)