import re
import sys

def replace_third_word(match):
    if match.group(2):  
        replacement = 'x' * len(match.group(2))
        return f"{match.group(1)}{replacement}{match.group(3)}"
    else:
        return match.group(0)  

def replace_third_word_in_line(line):
    
    pattern = re.compile(r'((?:\b\w+\b\s+){2})(\b\w+\b)(.*)')
    replaced_line = pattern.sub(replace_third_word, line)

    return replaced_line


for line in sys.stdin:
    output_line = replace_third_word_in_line(line.strip())
    sys.stdout.write(output_line + '\n')