题目

#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,first,second,third;
	cin>>a;
	first=a%10;
	second=a%100;
	third=a%1000;
	cout<<third<<second<<first;
	return 0;
}

求指点，样例错的，没思路！！！