#include <iostream>
using namespace std;

int main(){
    int month;
    cin>>month;
    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==12 || month==1 || month==2)
        cout<<"冬季";
    else
        cout<<"不合法";
    return 0;
}