#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");
    }else {
        swap(&x, &y);
        printf(" %d %d", x, y);
    }
    printf("%d\n");
    return 0;
}