#include <bits/stdc++.h>
#define all(x) x.begin(),x.end()
#define long long long
#define INF 1000000001
#define LNF 10000000011000000001
using namespace std;

int main()
{
	ios_base::sync_with_stdio(0); 
    cin.tie(0);
    
    int n;
    cin >> n;
    string s;
    cin >> s;

    int p = 1;
    int r = 0;
    for(int i = 0; i<s.size(); i++)
    {
        if(s[i] == 'B')
            r+=1+(i%2);
    }

    if(r%3)
        cout << "Alice" << endl;
    else
        cout << "Bob" << endl;
    return 0;
}