#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>

int main()
{
    int wordlength;
    scanf("%d\n", &wordlength);

    int db = 0;

    char c;
    while(true)
    {
        scanf("%c", &c);
        if (c == '_')
        {
            db++;
        }
        if (c == '\n') break;
    }
    int sol = 1;
    for (int i = 26 - wordlength + 1; i <= 26 - (wordlength - db); i++) {
        sol *= i;
    }
    printf("%d", sol);

    return 0;
}