# include<stdio.h>
void swap(int *a, int *b){
    int temp *a;
    *a=*b;
    *b=temp;
}
int main()
{
    int d1, d2;
    void(*fp)(int *, int*);
    if(scanf("%d",&d1) !=1 || scanf("%d",&d2) !=1){
        printf("Invalid input");
        return 0;
    }
    fp=swap;
    fp(&d1,&d2);
    printf("After swap: Distance 1 = %d meters Distance 2=%d meters",d1,d2);
    return 0;
}