#include<stdio.h>
void swap(int *a, int *b ) {
    int t = *a;
    *a = *b;
    *b = ;
}
int main (){
    int x, y;
    if (scanf("%d", &y) !=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;
}