#include <cstdio>
#include <iostream>
#include <sstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <climits>
#include <cfloat>
using namespace std;

int main()
{
    for(;;){
        int n;
        cin >> n;
        if(n == 0)
            return 0;

        vector<int> a(n);
        for(int i=0; i<n; ++i)
            cin >> a[i];
        sort(a.begin(), a.end());

        int m = 1;
        int ret = -1;
        for(int i=1; i<n; ++i){
            if(a[i] != a[i-1]){
                if(m > n / 2)
                    ret = a[i-1];
                m = 1;
            }else{
                ++ m;
            }
        }
        if(m > n / 2)
            ret = a[n-1];

        if(ret == -1)
            cout << "NO COLOR" << endl;
        else
            cout << ret << endl;
    }
}