djfz-2020-s444507/TaskD01/run.py

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

for line in sys.stdin:
    print(re.sub(r'\b[a-ząćęłńóśźż]+[A-ZĄĆĘŁŃÓŚŹŻ]+\b|\b[A-ZĄĆĘŁŃÓŚŹŻ]+[a-ząćęłńóśźż]+\b', repl, line).rstrip('\n'))