#include <bits/stdc++.h>
using namespace std;
int main(){
   int x,s,b,n,m; 
   cin>>x;
   b=x/1%10;
   n=x/10%10;
   m=x/100%10;
   s=x/1000%10;
   cout<<b*1000+n*100+m*10+s; 
return 0;
}
/**************************************************************
	Problem: 1029
	User: lijinkai
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/