题解

#include<bits/stdc++.h>
using namespace std;
int main()
{	
	int n,r,sum=0;
	cin>>n;
	
	
	while(true)
	{
		r=n%10;
		sum=sum*10+r;
		n=n/10;

		if(n==0) break;
	}
	cout<<sum;
	return 0;
}