#include<iostream>
using namespace std;
int main(){
	int a,b,c,d,e;
	cin>>a;
	b=i/1000;
	c=i/100%10;
	d=i/10%10;
	e=i%10;
	cout<<e*1000+d*100+c*10+b;
}
/**************************************************************
	Problem: 1029
	User: zhuangsongyu
	Language: C++
	Result: Compile Error
****************************************************************/