---

AC代码： 

#include<iostream>

using namespace std;

int main()
{
	long long n;
	cin >> n;
	long long temp = n;
	long long sum = 0;
	while(temp != 0){
		int c = temp % 10;
		sum = sum * 10 + c;
		temp = temp / 10;
	}
	printf("%lld",sum);
	return 0;
}