#include <iostream>
#include <string>
#include <string.h>
using namespace std;

int main() {
	while(1){
		string str; cin >> str ; if(str=="0") break;
		int Color[3]={0};
		for(int i=1;i<str.size();i+=2){
			char ch[2];
			ch[0]=str[i],ch[1]=str[i+1];
			int tmp=0;
			for(int j=0;j<2;j++){
				if('0'<=ch[j] && ch[j]<='9') tmp+=(ch[j]-'0');
				else if('a'<=ch[j] && ch[j]<='f') tmp+=(ch[j]-'a')+10;
				if(j==0) tmp*=16;
			}
			Color[(int)( (i-1)/2 )] = tmp;
		}
		int samp[8][3]; memset(samp,0,sizeof(samp));
		samp[1][2]=samp[2][1]=samp[3][1]=samp[3][2]=255;
		samp[4][0]=samp[5][0]=samp[5][2]=samp[6][0]=samp[6][1]
		=samp[7][0]=samp[7][1]=samp[7][2]=255;
		string tmp[8];
		tmp[0]="black", tmp[1]="blue", tmp[2]="lime", tmp[3]="aqua",
		tmp[4]="red", tmp[5]="fuchsia", tmp[6]="yellow", tmp[7]="white";
		long MIN=0; for(int i=0;i<3;i++) MIN+=Color[i]*Color[i];
		string ans="black";
		for(int i=1;i<8;i++){
			long TMP=0;
			for(int j=0;j<3;j++) TMP+=(Color[j]-samp[i][j])*(Color[j]-samp[i][j]);
			if(TMP<MIN) MIN=TMP, ans=tmp[i];
		}
		cout << ans << '\n' ;
	}
}