Codeforces Round#447 Div2 QAQ

A. QAQ

time limit per test

1 second

memory limit per test

256 megabytes

input

standard input

output

standard output

"QAQ" is a word to denote an expression of crying. Imagine "Q" as eyes with tears and "A" as a mouth.

Now Diamond has given Bort a string consisting of only uppercase English letters of lengthn. There is a great number of "QAQ" in the string (Diamond is so cute!).

Bort wants to know how many subsequences "QAQ" are in the string Diamond has given. Note that the letters "QAQ" don't have to be consecutive, but the order of letters should be exact.

Input

The only line contains a string of length n (1 ≤ n ≤ 100). It's guaranteed that the string only contains uppercase English letters.

Output

Print a single integer — the number of subsequences "QAQ" in the string.

Examples

Input

QAQAQYSYIOIWIN

Output

4

Input

QAQQQZZYNOIWIN

Output

3

Note

In the first example there are 4 subsequences "QAQ": "QAQAQYSYIOIWIN", "QAQAQYSYIOIWIN", "QAQAQYSYIOIWIN", "QAQAQYSYIOIWIN".

题意: 给一个字符串，让你找出含有多少个QAQ

题解:水题，三层循环直接暴力解出来

#include <bits/stdc++.h>

using namespace std;

int main()
{
    string s;
    cin>>s;
    int l=s.length();
    int ans=0;
    for(int i=0;i<l;i++)
    {
        for(int j=i+1;j<l;j++)
        {
            for(int k=j+1;k<l;k++)
            {
                if(s[i]=='Q'&&s[j]=='A'&&s[k]=='Q')
                {
                    ans++;
                }
            }
        }
    }
    cout<<ans<<endl;

    return 0;
}