#include<iostream>
#include<cstdio>
using namespace std;

int main()
{

        int n, a = 1, counter = 0;
        string s;
        cin >> n;

        for (int i = 0; i < n; ++i)
         {
          cin >> s;
                if (s[0] == 'A' || s[0] == 'P' ||s[0] == 'O' ||s[0] == 'R' &&  a == 2){ a = 1; counter++;}
            else
                 if (s[0] == 'A' || s[0] == 'P' ||s[0] == 'O' ||s[0] == 'R' &&  a == 3){ a = 1; counter +=2;}

                 if (s[0] == 'B' || s[0] == 'M' ||s[0] == 'S' &&  a == 1){ a = 2; counter++;}

            else

                 if (s[0] == 'B' || s[0] == 'M' ||s[0] == 'S' &&  a == 3){ a = 2; counter++;}


                if (s[0] == 'D' || s[0] == 'G' ||s[0] == 'K' ||s[0] == 'T' || s[0] == 'W' &&  a == 1){ a = 3; counter +=2;}

            else

                if (s[0] == 'D' || s[0] == 'G' ||s[0] == 'K' ||s[0] == 'T' || s[0] == 'W' &&  a == 2){ a = 3; counter++;}



        }

        cout << counter;
        return 0;

}

You list D, G, K, T, W, but not J.