#include <bits/stdc++.h> using namespace std; int main() { int a,b,c,d,e,f,g; cin>>a;//1234 b=a/10; //123 c=a%10;//4 d=b/10;//12 e=b%10;//3 f=d/10;//1 g=d%10;//2 cout<<c<<f<<g<<e; return 0; }