C Problem

#include <stdio.h>

int main()
{
    int a,b,c,d,e,f,x,y,z;
    printf("Input (Put two digits by using a space in every line) :\n");
    scanf("%d %d", &a, &b);
    c=a+b;
    scanf("%d %d", &d, &e);
    f=d+e;
    scanf("%d %d", &x, &y);
    z=x+y;
    {
        printf("Output\n");
    }
    {
        printf("%d\n%d\n%d\n",c,f,z);
    }
    return 0;
}