#include "bits/stdc++.h"

using namespace std;

typedef vector<int> vi;
typedef pair<int,int> pii;
typedef long long ll;

#define dump(x)  cerr << #x << " = " << (x) << endl
#define rep(i,n) for(ll i=0;i<(ll)(n);i++)
#define all(a)  (a).begin(),(a).end()
#define pb push_back
#define INF 999999999

int btoh(string s){
    if(s.size()!=2)cout<<"error"<<endl;
    int ret=0;
    if('0'<=s[1]&&s[1]<='9')ret+=(s[1]-'0');
    else{
        ret+=10+(int)(s[1]-'a');
    }
    if('0'<=s[0]&&s[0]<='9')ret+=(s[0]-'0')*16;
    else{
        ret+=(10+(int)(s[0]-'a'))*16;
    }
    return ret;
}

double solve(string a,string b,string c,string d,string e,string f){
    int x,y,z;
//    cout<<btoh(a)<<" "<<btoh(b)<<" "<<btoh(c)<<" "<<btoh(d)<<" "<<btoh(e)<<" "<<btoh(f)<<endl;
    x=(btoh(a)-btoh(d)) * (btoh(a)-btoh(d));
    y=(btoh(b)-btoh(e)) * (btoh(b)-btoh(e));
    z=(btoh(c)-btoh(f)) * (btoh(c)-btoh(f));
    
    return sqrt(x+y+z);
}

int main(){
//    string color = {"black","blue",}
    string s;
    while(cin>>s){
        if(s=="0")break;
        string a,b,c;
        a=s.substr(1,2);
        b=s.substr(3,2);
        c=s.substr(5,2);
        string ans="";
        double d=INF;
        
        double t=solve(a,b,c,"00","00","00");
        if(t<d){
            d=t;
            ans="black";
        }
        
        t=solve(a,b,c,"00","00","ff");
        if(t<d){
            d=t;
            ans="blue";
        }
        
        t=solve(a,b,c,"00","ff","00");
        if(t<d){
            d=t;
            ans="lime";
        }
        
        t=solve(a,b,c,"00","ff","ff");
        if(t<d){
            d=t;
            ans="aqua";
        }
        
        t=solve(a,b,c,"ff","00","00");
        if(t<d){
            d=t;
            ans="red";
        }
        
        t=solve(a,b,c,"ff","00","ff");
        if(t<d){
            d=t;
            ans="fuchsia";
        }
        
        t=solve(a,b,c,"ff","ff","00");
        if(t<d){
            d=t;
            ans="yellow";
        }
        
        t=solve(a,b,c,"ff","ff","ff");
        if(t<d){
            d=t;
            ans="white";
        }
        cout<<ans<<endl;
    }
}

/*
 black	00	00	00
 blue	00	00	ff
 lime	00	ff	00
 aqua	00	ff	ff
 red	ff	00	00
 fuchsiaff	00	ff
 yellow	ff	ff	00
 white	ff	ff	ff

 */