#include <iostream>

using namespace std;

struct abc{int x,y;} carac[40], pos1, pos2;
string qwe = "QWERTYUIOPASDFGHJKLZXCVBNM";

int main()
{
    string str;

    //freopen("txt.in", "r", stdin);

    int lin = 1, col = 1;
    for(const auto& it : qwe) {
        carac[it - 'A'] = {lin, col};
        ++col;
        if(it == 'P' || it == 'L') {
            lin++;
            col = 1;
        }
    }

    cin >> str;

    int sum = 0;
    pos1 = carac['F' - 'A'];
    pos2 = carac['J' - 'A'];
    for(const auto& it : str) {
        int dist1 = abs(pos1.x - carac[it - 'A'].x) + abs(pos1.y - carac[it - 'A'].y);
        int dist2 = abs(pos2.x - carac[it - 'A'].x) + abs(pos2.y - carac[it - 'A'].y);
        if(dist1 > dist2) {
            pos2 = carac[it - 'A'];
            sum += dist2;
        } else {
            pos1 = carac[it - 'A'];
            sum += dist1;
        }
    }

    cout << sum << "\n";

    return 0;
}