#include <stdio.h>

int main(){
    int c,s;
    while((c = getchar()) != EOF){
        if(c != ' ' && c != '\t' && c!= '\n'){
            putchar(c);
            s = 0;
        }else{
            if(s !=1){
                putchar('\n');
            }
            s = 1;
        }

    }
}