有坑

#include <iostream>
using namespace std;

int main(){
	int n;
	cin >> n;
	
	int a=n/1000;
	int b=n%1000;
	
	
	if(b > a){
		cout << b << a;
 	}
	else{
		if(b/10 < 10){
			cout << a << '0' << b;
		}
		else cout << a << b;
	}

	return 0;
}