#include <iostream>
using namespace std;

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

    // write your code here......
    if(month>=3 && month<=5) 
    {
        cout<<"春季";
    }
    else if(month>=6 && month<=8) 
    {
        cout<<"夏季";
    }
    else if(month>=9 && month<=11) 
    {
        cout<<"秋季";
    }
    else if(month==1 || month == 2 ||month==12 )
    {
        cout<<"冬季";
    } 
    else 
    {
        cout<<"不合法"; 
    }   
    return 0;
}