#include<stdio.h>
void swap(int *a, int *b){
    int temp;
    temp = *a;
    *a = *b;
    *b = temp;
}
int main(){
    int x, y;
   if (scanf("%d", &x); != 1 || scanf("%d", &y) != 1){
        printf("Invalid Input\n");
        return 0;
   }
   if (x < 0 || y < 0){
       printf ("Invalid Input\n");
    } else {
        swap(&x, &y);
        printf("%d\n%d", x, y);
    }
    return 0;
}