题解

#include<iostream>
using namespace std;
int main(){
    int n;
    cin>>n;
    if(n<1200){
        cout<<"grey";
    }else if(n<1400){
        cout<<"green";
    }else if(n<1600){
        cout<<"cyan";
    }else if(n<1900){
        cout<<"blue";
    }else if(n<2100){
        cout<<"purple";
    }else if(n<2400){
        cout<<"orange";
    }else if(n<3000){
        cout<<"red";
    }else{
        cout<<"red-black";
    }
    return 0;
}