#include <iostream>
#include <ostream>
using namespace std;

int main() {
    
    int month;
    cin >> month;

    if(month >=3 && month <=5)
    cout <<"春季"<<endl;
    else if(month >= 6 && month <= 8)
    cout <<"夏季"<<endl;
    else if(month >= 9 && month <=11)
    cout <<"秋季"<<endl;
    else if(month == 1 || month == 2 || month == 12)
    cout <<"冬季"<<endl;
    else
     cout <<"不合法"<<endl;
    

    return 0;
}