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

int main(){
    int n, i;
    while( cin >> n, n ){
        vector<int> v(n);
        for(i=0;i<n;i++){
            cin >> v[i];
        }
        sort(v.begin(), v.end());
        int t = v[n/2], count = 1;
        for(i=n/2-1;i>=0;i--){
            if( v[i]-t ) break;
            count++;
        }
        for(i=n/2+1;i<n;i++){
            if( v[i]-t ) break;
            count++;
        }
        if( count > n/2 ){
            cout << t << endl;
        }else{
            cout << "NO COLOR" << endl;
        }
    }
    return 0;
}