djfz-2023-s464933/TaskF05/run.py

import re
import sys


def replaceThirdWordWithX(input):
    empty0 = input.group(1)
    group1 = input.group(2)
    empty1 = input.group(3)
    group2 = input.group(4)
    empty2 = input.group(5)
    group3 = "x" * (len(input.group(6)))
    rest = input.group(7)
    if empty0 is None:
        return f'{group1}{empty1}{group2}{empty2}{group3}{rest}'
    else:
        return f'{empty0}{group1}{empty1}{group2}{empty2}{group3}{rest}'


pattern = r'(\W+)?(\w+)(\W+)(\w+)(\W+)(\w+)(.*)'

for line in sys.stdin:
    line = line.strip('\n')

    match = re.match(pattern, line)
    if match:
        result = replaceThirdWordWithX(match)
        print(result)
    else:
        print(line)