QAQ

///http://codeforces.com/problemset/problem/698/A
///https://trello.com/c/d7uV2sBM/32-problem-894a-codeforces

#include <iostream>
#include <vector>
using namespace std;

int main()
{
    string s;
    cin>>s;

    int Q=0, QA=0, QAQ = 0;

    for(int i=0; i<s.size(); i++)
    {
        if (s[i]=='Q')
            QAQ+=QA, Q++;

        if (s[i]=='A')
            QA+=Q;
    }
    cout<<QAQ;

    return 0;
}