#include<stdio.h>
void swap(&d1,&d2){
    
    d1=(d1+d2) - (d2=d1);
    
}

int main(){
    int dist1,dist2;
    scanf("%d %d",dist1,dist2);
    
    if(dist1<0 || dist2<0){
        printf("Invalid Input");
    }
    swap(dist1,dist2);
}