【codeforces 894A】QAQ

A. QAQ【题目链接】

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 length n. There is a great number of "QAQ" in the string (Diamond is so cute!).

illustration by 猫屋 https://twitter.com/nekoyaliu

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

Copy

QAQAQYSYIOIWIN

output

Copy

input

Copy

QAQQQZZYNOIWIN

output

Copy

Note

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

将每个'A'两边的'Q'个数相乘之后加和即可

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;int main()
{ll n;string s;ll i;cin>>s;ll q=0;ll l=s.length();for(i=0;i<l;i++){if(s[i]=='Q') q++;}ll ans=0;ll temp=0;for(i=0;i<l;i++){if(s[i]=='Q')temp++;if(s[i]=='A'){ans+=temp*(q-temp);}}cout<<ans<<endl;return 0;
}

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