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

int main(){

	int color[8][3] = {{0, 0, 0}, {0, 0, 255}, {0, 255, 0}, {0, 255, 255}, {255, 0, 0}, {255, 0, 255}, {255, 255, 0}, {255, 255, 255}};
	double d, f, p[3];
	string str, c;

	while(cin >> str){
		if(str[0] == '0') break;

		d = sqrt(3 * pow(255, 2));
		for(int j=0; j<3; j++){
			if(str[2*j+1] >= '0' && str[2*j+1] <= '9') p[j] = 16 * (str[2*j+1] - '0');
			else p[j] = 16 * (10.0 + str[2*j+1] - 'a');
				
			if(str[2*j+2] >= '0' && str[2*j+2] <= '9') p[j] += str[2*j+2] - '0';
			else p[j] += 10.0 + str[2*j+2] - 'a';
		}
		
		for(int i=0; i<8; i++){
			f = sqrt(pow(p[0] - color[i][0], 2) + pow(p[1] - color[i][1], 2) + pow(p[2] - color[i][2], 2));
			if(d > f){
				d = f;
				switch(i){
					case 0: c = "black"; break;
					case 1: c = "blue"; break;
					case 2: c = "lime"; break;
					case 3: c = "aqua"; break;
					case 4: c = "red"; break;
					case 5: c = "fuchsia"; break;
					case 6: c = "yellow"; break;
					case 7: c = "white"; break;
				}
			}
		}
		
		cout << c << endl;
	}

	return 0;

}