#include <bits/stdc++.h>
using namespace std;
vector<string> split(const string& s, char c) {
  vector<string> v;
  stringstream ss(s);
  string x;
  while (getline(ss, x, c)) v.emplace_back(x);
  return move(v);
}
template <typename T, typename... Args>
inline string arrStr(T arr, int n) {
  stringstream s;
  s << "[";
  for (int i = 0; i < n - 1; i++) s << arr[i] << ",";
  s << arr[n - 1] << "]";
  return s.str();
}
inline void __evars_begin(int line) { cerr << "#" << line << ": "; }
template <typename T>
inline void __evars_out_var(vector<T> val) {
  cerr << arrStr(val, val.size());
}
template <typename T>
inline void __evars_out_var(T* val) {
  cerr << arrStr(val, 10);
}
template <typename T>
inline void __evars_out_var(T val) {
  cerr << val;
}
inline void __evars(vector<string>::iterator it) { cerr << endl; }
template <typename T, typename... Args>
inline void __evars(vector<string>::iterator it, T a, Args... args) {
  cerr << it->substr((*it)[0] == ' ', it->length()) << "=";
  __evars_out_var(a);
  cerr << "; ";
  __evars(++it, args...);
}
struct edge {
  long long a, b, cost;
  edge(long long x, long long y, long long z) : a(x), b(y), cost(z){};
};
long long ans = 0;
void fn(string s, long long i, long long cnt) {
  if (i == s.length() || cnt == 3) {
    if (cnt == 3) ans++;
    return;
  }
  if (!cnt) {
    if (s[i] == 'Q') fn(s, i + 1, cnt + 1);
    fn(s, i + 1, cnt);
  } else if (cnt == 1) {
    if (s[i] == 'A') fn(s, i + 1, cnt + 1);
    fn(s, i + 1, cnt);
  } else {
    if (s[i] == 'Q') fn(s, i + 1, cnt + 1);
    fn(s, i + 1, cnt);
  }
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  string s;
  cin >> s;
  fn(s, 0, 0);
  cout << ans << endl;
  return 0;
}
