#include <stdio.h>
void swap (int *a, int *b) {
    int t =  *a;
    *a = *b;
    *b = t;
}
int main(){
    int x, y;
    if (scanf("%d" , &x) != 1 ||
        scanf("%d" , &y) !=1)
        printf("Invalid input");
        return 0;
        }
        void (*fp)(int*, int*) = swap;
        fp(&x,&y);
        printf("After swap: Distance 1 = %d meter Distance 2 = %d meters", x, y);
        return 0;
        }
}