/* Problem URL: https://codeforces.com/problemset/problem/894/A */

#include <bits/stdc++.h>

using namespace std;

#define V vector

#define rmin(a, b) a = min(a, b)
#define rmax(a, b) a = max(a, b)

#define rep(i, lim) for (int i = 0; i < (lim); i++)
#define nrep(i, s, lim) for (int i = s; i < (lim); i++)

#define repv(i, v) for (auto &i : (v))
#define fillv(v) for (auto &itr_ : (v)) { cin >> itr_; }
#define sortv(v) sort(v.begin(), v.end())
#define all(v) (v).begin(), (v).end()

using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vvvvi = vector<vvvi>;

using ll = long long;

using vl = vector<ll>;
using vvl = vector<vl>;
using vvvl = vector<vvl>;
using vvvvl = vector<vvvl>;

template<class v>
auto operator<<(ostream &os, const vector<v> &vec)->ostream& {
    os << vec[0];
    for (size_t i = 1; i < vec.size(); i++) {
        os << ' ' << vec[i];
    }
    os << '\n';
    return os;
}

template<class v>
auto operator>>(istream &is, vector<v> &vec)->istream& {
    for (auto &i : vec) {
        is >> i;
    }
    return is;
}

template<class v>
auto operator<<(ostream &os, const vector<vector<v>> &vec)->ostream& {
    for (auto &i : vec) {
        os << i[0];
        for (size_t j = 1; j < i.size(); j++) {
            os << ' ' << i[j];
        }
        os << '\n';
    }
    return os;
}

template<class v>
auto operator>>(istream  &is, vector<vector<v>> &vec)->istream& {
    for (auto &i : vec) {
        for (auto &j : i) {
            is >> j;
        }
    }
    return is;
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    string a;
    cin >> a;

    vi dp1(a.size());
    vi dp2(a.size());
    vi dp3(a.size());

    dp1[0] = a[0] == 'Q';

    nrep(i, 1, a.size()) {
        if (a[i] == 'Q') {
            dp1[i]++;
            dp3[i] += dp2[i - 1];
        
        }

        if (a[i] == 'A') {
            dp2[i] += dp1[i - 1];
        }

        dp1[i] += dp1[i - 1];
        dp2[i] += dp2[i - 1];
        dp3[i] += dp3[i - 1];
    }

    cout << dp3.back() << '\n';
}