#include <stdio.h>
#include <stdlib.h>

#define EOL '\n'
#define TAB '\t'
#define SPACE ' '
#define TABSTOP 4

int main() {
    int n = 0;

    while(1) {
        int c = getchar();

        if(c == EOF) {
            break;
        }

        if(c == EOL) {
            putchar(c);
            n = 0;

            continue;
        }

        if(c == TAB) {
            while(n < TABSTOP) {
                putchar(SPACE);
                n++;
            }

            if(n >= TABSTOP) {
                n = 0;
            }

            continue;
        }

        putchar(c);
        n++;

        if(n >= TABSTOP) {
            n = 0;
        }
    }

    return EXIT_SUCCESS;
}