#include<stdio.h>

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

int main()  {
    int x, y;
    if (scanf("%d", &x) != 1) {
        return 1;
    }
    if (scanf("%d", &y) != 1) {
        return 1;
    }
    
    if (x < 0 || y < 0) {
        printf("Invalid Input\n");
    } else {
        swap(&x, &y);
        printf("%d\n", x, y);
    }
    
    return 0;
}