#include <stdio.h>

#define TRUE 1
#define FALSE 0

main()
{

    int c;
    int blanks = FALSE;

    while ((c = getchar()) != EOF){

        if (c != ' '){
            blanks = FALSE;
            putchar(c);
        }
        else
            if ((c == ' ') && (blanks == FALSE)){
                blanks = TRUE;
                putchar(c);
            }
    }
}