import re

def process_line(line):
    words = re.findall(r'\w+', line)
    if len(words) >= 3:
        third_word = words[2]
        replacement = 'x' * len(third_word)
        line = re.sub(r'\b' + re.escape(third_word) + r'\b', replacement, line)

    return line

with open('simple.in', 'r', encoding='utf-8') as file:
    for line in file:
        processed_line = process_line(line)
        print(processed_line, end='')