80分，C++

#include <bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	cin >> n;
	if (n < 0)n=abs(n),cout<<"-";
	if (n%10==0)n/=10;
    if (n ==0)cout<<n;
	while(n !=0)
	{
		int num=n%10;
		cout << num;
		n/=10;
	}
	return 0;
}