import re
import sys

def swap_case(match):
    word = match.group()
    return ''.join(c.lower() if c.isupper() else c.upper() for c in word)

def transform_text(input_text):
    pattern = re.compile(r'\b(?=\w*[a-ząćęłńóśźż])(?=\w*[A-ZĄĆĘŁŃÓŚŹŻ])\w+\b')
    transformed_text = pattern.sub(swap_case, input_text)

    return transformed_text


for line in sys.stdin:
    output_text = transform_text(line)
    sys.stdout.write(output_text)