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