#!/usr/bin/python3
"""
This is a very-very simple filename sanitizer program written in python
"""

import sys                  # argv
import os                   # rename
import unicodedata as unid  # normalize
sys.tracebacklimit = 0

def test_special_char(my_char):
    """
    Test if a character is special in terms of filename
    """
    char_num = ord(my_char)
    if char_num > 127:   # case ß
        return False

    return (
        my_char.isalnum() or
        char_num == 95 or
        char_num == 47 or
        char_num == 46 or
        char_num == 45
    ) and (char_num < 127)


def sanitize(filename):
    """
    A simple filename sanitizer
    """
    spaceless_unicode = ["_" if i == " " else i for i in filename]
    spaceless_unicode = unid.normalize("NFKD", "".join(spaceless_unicode))
    ret = [i if test_special_char(i) else "" for i in spaceless_unicode]
    return "".join(ret)


if __name__ == "__main__":
    for row in sys.stdin:
        print(sanitize(row))