#include<bits/stdc++.h>
using namespace std;
int main(){
   	int a,s,d;
   	cin>>a;
   	s=a%1000;
   	d=(a-s)/1000;
   	if(d>s){
   		cout<<d<<s;
	   }else{
	   	cout<<s<<d;
	   }
  }
/**************************************************************
	Problem: 1631
	User: tonghuawei
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/