#include <stdio.h>
#include <ctype.h>

void Read()
{
    int c;
    int need_space = 0;
    while((c = getchar()) != EOF)
    {
        if(!isspace(c))
        {
            putchar(c);
            need_space = 1;
        }
        if(isspace(c))
        {
            if(need_space)
            {
                putchar(' ');
                need_space = 0;
            }
        }
    }
}

int main()
{
    Read();
    return 0;
}