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