#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 meters Distance 2 = %d meters", x.y);
    return 0;
}