#include <stdio.h>

int swap(int *a, *b){
    int temp = *a;
    *a=*b;
    *b=temp;
}

int main(){
    int x,y;
    scanf("%d %d",&x,&y);
    if(x<=0 || y<=0){
        printf("Invalid input\n");
        return 0;
    }
    
    swap(&x, &y);
    printf("%d %d", x, y);
    return 0;
}