#include <stdio.h>

void swap(int *num1, int *num2){
    int temp = *num1;
    *num1 = *num2;
    *num2 = temp;
}

int main(){
    int num1,num2;
    scanf("%d\n %d", &num1, &num2);
    
    if((num1 || num2) < 0){
        printf("Invalid Input");
        return 0
    }
    
    swap(&num1, &num2);
    printf("%d\n%d",num1, num2);
}