代码如下:

#include <iostream>
using namespace std;
int main() {
    long long n;  
    cin >> n;    
    if (n > 0) {
        cout << "positive" << endl;
    } else if (n == 0) {
        cout << "zero" << endl;
    } else {
        cout << "negative" << endl;
    }
    
    return 0;
}