#include <bits/stdc++.h>
using namespace std;

const int N = 50;
int sg[N];

int main(void) {
    for (int i = 1; i < N; ++i)
        sg[i] = i % 3 + (i % 3 == 0 ? 3 : 0);

    int c[26] = { 0 };
    string s; cin >> s;
    for (char ch : s)
        c[ch - 'A']++;
    
    int ans = 0;
    for (int i = 0; i < 26; ++i)
        if (c[i])
            ans ^= sg[c[i]];
    
    printf("%s\n", ans == 0 ? "Bob" : "Alice");

    return 0;
}