// editor4
#include<stdio.h>
int main(){
    int num1,num2;
    scanf("%d%d",&num1,&num2);
    if(num1<0||num2<0)
    {
        printf("Invalid Input");
    }
    swap(&num1,&num2);
    printf("%d %d",num1,num2);
    return 0;
}
int swap(int *n1,int *n2)
{
    int temp;
    temp =*n2;
    *n2 =*n1;
    *n1 = temp;
}