Problem:
Score : 300 points

Problem Statement

There are N people. The name of the i-th person is S_i.

We would like to choose three people so that the following conditions are met:

The name of every chosen person begins with M, A, R, C or H.

There are no multiple people whose names begin with the same letter.

How many such ways are there to choose three people, disregarding order?

Note that the answer may not fit into a 32-bit integer type.

Constraints

1 \leq N \leq 10^5

S_i consists of uppercase English letters.

1 \leq |S_i| \leq 10

S_i \neq S_j (i \neq j)

Input

Input is given from Standard Input in the following format:

N
S_1
:
S_N

Output

If there are x ways to choose three people so that the given conditions are met, print x.

Sample Input 1

5
MASHIKE
RUMOI
OBIRA
HABORO
HOROKANAI

Sample Output 1

2

We can choose three people with the following names:

MASHIKE, RUMOI, HABORO

MASHIKE, RUMOI, HOROKANAI

Thus, we have two ways.

Sample Input 2

4
ZZ
ZZZ
Z
ZZZZZZZZZZ

Sample Output 2

0

Note that there may be no ways to choose three people so that the given conditions are met.

Sample Input 3

5
CHOKUDAI
RNG
MAKOTO
AOKI
RINGO

Sample Output 3

7

Solution in C# (Mono 4.6.2.0) (judge verdict: Wrong Answer)

using System;
using System.Collections.Generic;
using System.Linq;

public static partial class Program
{
    //テンプレここから
    public static int ToInt(this string str)
    {
        return int.Parse(str);
    }

    public static long ToLong(this string str)
    {
        return long.Parse(str);
    }
    public static IEnumerable<int> ToInt(this string[] strs)
    {
        return strs.Select(x => x.ToInt());
    }

    public static IEnumerable<long> ToLong(this string[] strs)
    {
        return strs.Select(x => x.ToLong());
    }
    public static IEnumerable<int> SplToInt(this string str, char opr = ' ')
    {
        return str.Split(opr).ToInt();
    }

    public static IEnumerable<long> SplToLong(this string str, char opr = ' ')
    {
        return str.Split(opr).ToLong();
    }
    public static string CRL()
    {
        return Console.ReadLine();
    }
    public static void CWL(object obj)
    {
        Console.WriteLine(obj);
    }
    public static int Diff(int a, int b)
    {
        return Math.Abs(Math.Max(a, b) - Math.Min(a, b));
    }
    public static long Diff(long a, long b)
    {
        return Math.Abs(Math.Max(a, b) - Math.Min(a, b));
    }
    public static int Sign(this int i)
    {
        return Math.Sign(i);
    }
    //テンプレここまで
}

public static partial class Program
{
    static void Main()
    {
        var n = CRL().ToInt();
        var strs = new List<string>();
        for (int i = 0; i < n; i++)
        {
            strs.Add(CRL());
        }

        var counts = new int[5];
        const string march = "MARCH";
        for (int i = 0; i < 5; i++)
        {
            counts[i] = strs.Where(x => x[0] == march[i]).Count();
        }

        var num = 0;
        var p = new int[] {0, 0, 0, 0, 0, 0, 1, 1, 1, 2};
        var q = new int[] {1, 1, 1, 2, 2, 3, 2, 2, 3, 3};
        var r = new int[] {2, 3, 4, 3, 4, 4, 3, 4, 4, 4};
        for (int i = 0; i < 10; i++)
        {
            num += counts[p[i]] * counts[q[i]] * counts[r[i]];
        }

        CWL(num);
    }
}