#include<bits/stdc++.h> using namespace std; int main(){ int n,ge,shi,bai,qian,t; cin>>n; ge=n%10; shi=n/10%10; bai=n/10/10%10; qian=n/1000; t=ge; ge=shi; shi=bai; bai=qian; qian=t; cout<<qian<<bai<<shi<<ge; return 0; }