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