#include <stdio.h>

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

int main()
{
    int X, Y;
    
    scanf("%d", &X);
    scanf("%d", &Y);
    
    if(X < 0 || Y < 0)
    {
        printf("Invalid Input");
        return 0;
    }
    
    
    swap(&X);
    swap(&Y);
    
    printf("%d\n", X);
    printf("%d",Y);
    
    return 0;
}