#include <bits/stdc++.h>

using namespace std;

string s;
int l;

void selection_sort()
{
    for (int i = 0;i < 15;i++){
        int t = i;
        for (int j = i+1;j < l;j++){
            if (s[t] > s[j])t = j;
        }
        if (i != t){
            char ch = s[t];
            s[t] = s[i];
            s[i] = ch;
        }
    }
}
int main()
{
    int t, result = 0;
    scanf("%d", &t);
    string test_s;
    char ch = 'a';
    for (int i = 0;i < 26;i++, ch++){
        test_s[i] = ch;
    }
    while (t--){
        cin >> s;
        l = s.length();

        selection_sort();

        for (int i = 0;i < 15;i++){
            int carry = 1;
            for (int j = 0;s[i] != test_s[j];j++)carry++;
            result += carry;
        }
    }
    printf("%d\n", result);
    return 0;
}