#include<iostream>
#include<algorithm>
using namespace std;
int n,key,cnt,ans;
int t[1000001];
int main(){
  while(cin>>n&&n){
    for(int i=0;i<n;i++)cin>>t[i];
    t[n]=ans=-1;
    sort(t,t+n);
    key=t[0];
    cnt=1;
    for(int i=1;i<=n;i++){
      if(key==t[i])cnt++;
      else{
	if(cnt>n/2)ans=key;
	key=t[i];
	cnt=1;
      }
    }
    if(ans==-1)cout<<"NO COLOR"<<endl;
    else cout<<ans<<endl;
  }
  return 0;
}