#include <iostream>
#include <cstring>
using namespace std;
int main()
{
    int ans = 0, size;
    string str;
    cin >> str;
    size = str.size();
    for (int i = 0; i < size; i++)
    {
        if (str[i] == 'a')
        {
            if (i != size - 1)
            {
                if (str[i + 1] == 'c')
                {
                    ans += 2;
                    i++;
                }
                else if (str[i + 1] == 'b')
                {
                    ans += 5;
                    i++;
                }
                else
                {
                    ans++;
                }
            }
            else
            {
                ans += 1;
            }
        }
        else if (str[i] == 'b')
        {
            ans += 2;
        }
        else if (str[i] == 'c')
        {
            ans += 3;
        }
        else if (str[i] == 'd')
        {
            ans += 4;
        }
    }
    cout << ans << endl;
    return 0;
}