#!/usr/bin/tcc -run
#include <stdio.h>
 
int main(void)
{
    for(;;)
    {
        int c = getc(stdin);
        if(c == EOF)
            return 0;
        switch(c)
        {
            case ':':
            case ';':
            case '*':
            case '?':
            case '"':
            case '<':
            case '>':
            case '|':
                putc('_', stdout);
                continue;
        }
        putc(c, stdout);
    }
}