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

class Col
{
public:
  int R,G,B;
  Col():R(0),G(0),B(0){}
  Col(int R,int G,int B):R(R),G(G),B(B){}
};

int _16to10(string s)
{
  int a[2];
  for(int i=0;i<2;i++)
    {
      if(s[i] == 'a')
	a[i] = 10;
      else if(s[i] == 'b')
	a[i] = 11;
      else if(s[i] == 'c')
	a[i] = 12;
      else if(s[i] == 'd')
	a[i] = 13;
      else if(s[i] == 'e')
	a[i] = 14;
      else if(s[i] == 'f')
	a[i] = 15;
      else 
	a[i] = s[i] - '0';
    }
  return a[1]+a[0]*16;
}

int main()
{
  string s;
  vector<Col> vec;
  vector<string> name;
  vec.resize(8),name.resize(8);
  int ff = _16to10("ff");
  vec[0] = Col(0,0,0);
  vec[1] = Col(0,0,ff);
  vec[2] = Col(0,ff,0);
  vec[3] = Col(0,ff,ff);
  vec[4] = Col(ff,0,0);
  vec[5] = Col(ff,0,ff);
  vec[6] = Col(ff,ff,0);
  vec[7] = Col(ff,ff,ff);
  name[0] = "black";
  name[1] = "blue";
  name[2] = "lime";
  name[3] = "aqua";
  name[4] = "red";
  name[5] = "fuchsia";
  name[6] = "yellow";
  name[7] = "white";
  while(true)
    {
      cin >> s;
      if(s == "0")
	break;
      int R,G,B;
      R = _16to10(s.substr(1,2));
      G = _16to10(s.substr(3,2));
      B = _16to10(s.substr(5,2));

      double men = (1<<28),pos = -1;
      for(int i=0;i<8;i++)
	{
	  double d =  sqrt(pow(R-vec[i].R,2)+pow(B-vec[i].B,2)+pow(G-vec[i].G,2));
	  if(men > d)
	    {
	      men = d;
	      pos = i;
	    }
	}
      cout << name[pos] << endl;

    }
  return 0;
}