#include <iostream>
#include <vector>
#include <map>
#include <queue>
using namespace std;
#define ll long long

ostream& operator<<(ostream& os, vector<int>& input)
{
    for (auto i : input)
    {
        os << i << " ";
    }
    return os;
}

int main()
{
    cin.tie(nullptr);
    cout.tie(nullptr);
    ios_base::sync_with_stdio(false);
    int n, m = 0, q = 1;
    cin >> n;
    for (size_t i = 0; i < n; i++)
    {
        char a;
        cin >> a;
        if (a == '_') m++;
    }
    for (size_t i = m; i > 0; i--)
    {
        q *= 26 - n + i;
    }
    cout << q << endl;
    return 0;
}
/*
5
H O U S _
-22

3
A _ _
-600
*/