#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;

const int MAX_C = 8;

int main() {
	pair< int, string > colors[MAX_C] = {
		make_pair< int, string >(0x000000, "black"),
		make_pair< int, string >(0x0000ff, "blue"),
		make_pair< int, string >(0x00ff00, "lime"),
		make_pair< int, string >(0x00ffff, "aqua"),
		make_pair< int, string >(0xff0000, "red"),
		make_pair< int, string >(0xff00ff, "fuchsia"),
		make_pair< int, string >(0xffff00, "yellow"),
		make_pair< int, string >(0xffffff, "white")
	};
	string color, cname;
	int r, g, b, _r, _g, _b, min, dist;
	
	while(cin >> color, color != "0"){
		r = strtol(color.substr(1, 2).c_str(), NULL, 16);
		g = strtol(color.substr(3, 2).c_str(), NULL, 16);
		b = strtol(color.substr(5, 2).c_str(), NULL, 16);
		
		min = ~(1 << 31);
		cname;
		
		for(int i = 0; i < MAX_C; ++i){
			_r = (colors[i].first & 0xff0000) >> 16;
			_g = (colors[i].first & 0x00ff00) >> 8;
			_b = (colors[i].first & 0x0000ff);
			
			dist = (r - _r) * (r - _r) + (g - _g) * (g - _g) + (b - _b) * (b - _b);
			
			if(dist < min){
				min = dist;
				cname = colors[i].second;
			}
		}
		cout << cname << endl;
	}
	return 0;
}