#include<stdio.h>
int a,b,temp;
int fun (int a,int b){
    temp=a;
    a=b;
    b=temp;
}
 int main()
 {
     int a,b;
     scanf("%d%d",&a,&b);
     if (a<=0 || b<=0){
         printf(Invalid Input);
     }
     else
     { fun(a,b);
         print("%d\n",b);
         prinyt("%d",a);
     }
 }