#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;
}