#include<cstdio>
#include<iostream>
using namespace std;
int main(void){
	int color[8][3],i,j,k,rgb[3],min,c,d,r,g,b;
	color[0][0]=0; color[0][1]=0; color[0][2]=0;
	color[1][0]=0; color[1][1]=0; color[1][2]=255;
	color[2][0]=0; color[2][1]=255; color[2][2]=0;
	color[3][0]=0; color[3][1]=255; color[3][2]=255;
	color[4][0]=255; color[4][1]=0; color[4][2]=0;
	color[5][0]=255; color[5][1]=0; color[5][2]=255;
	color[6][0]=255; color[6][1]=255; color[6][2]=0;
	color[7][0]=255; color[7][1]=255; color[7][2]=255;
	char a[]="0123456789abcdef",s[8];
	while(1){
		for(i=0;i<3;i++)rgb[i]=0;
		cin>>s;
		if(s[0]=='0') break;
		i=0;
		for(j=1;j<6;j+=2){
			for(k=0;k<16;k++){
				if(s[j]==a[k]){
					rgb[i]=rgb[i]+k*16;
					break;
				}
			}
			for(k=0;k<17;k++){
				if(s[j+1]==a[k]){
					rgb[i]=rgb[i]+k;
					break;
				}
			}
			i++;
		}
		min=1000000;
		for(i=0;i<8;i++){
			r=color[i][0]-rgb[0];
			g=color[i][1]-rgb[1];
			b=color[i][2]-rgb[2];
			d=r*r+g*g+b*b;
			if(min>d){
				min=d;
				c=i;
			}
		}
		if(c==0) cout<<"black"<<endl;
		if(c==1) cout<<"blue"<<endl;
		if(c==2) cout<<"lime"<<endl;
		if(c==3) cout<<"aqua"<<endl;
		if(c==4) cout<<"red"<<endl;
		if(c==5) cout<<"fuchsia"<<endl;
		if(c==6) cout<<"yellow"<<endl;
		if(c==7) cout<<"white"<<endl;
//		printf("%d %d %d\n",rgb[0],rgb[1],rgb[2]);
	}
	return 0;
}