#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) !=){
        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;
}