import sys
import re


def replaceLetters(words):
    result = words.group(1)
    for i in words.group(2):
        result += 'x'
    return result


for line in sys.stdin:
    replaceXin3rdPos = re.sub(r'^(\W*\w+\W+\w+\W+)(\w+)', replaceLetters, line, 1)
    print(replaceXin3rdPos, end='')