#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;
}