#include<iostream>

using namespace std;

int main()

{

       int a,s,d,f,g,sum;

       cin>>a;

       s=a/1000;

       d=(a%1000)/100;

       f=(a%100)/10;

       g=a%10;

       sum=s+d*10+f*100+g*1000;

       cout<<sum<<endl;

       return 0;

}