#include <map>
#include <string.h>
#include <iostream>


using namespace std;


int main() {
    int front = 0;
    int res = 0;
    string str;
    multimap<char, int>::iterator it;
    multimap<char, int> dict{
        {' ', 0},
        {'a', 2},{'b', 2},{'c', 2},
        {'d', 3},{'e', 3},{'f', 3},
        {'g', 4},{'h', 4},{'i', 4},
        {'j', 5},{'k', 5},{'l', 5},
        {'m', 6},{'n', 6},{'o', 6},
        {'p', 7},{'q', 7},{'r', 7},{'s', 7},
        {'t', 8},{'u', 8},{'v', 8},
        {'w', 9},{'x', 9},{'y', 9},{'z', 9}
    };


    while (cin >> str) {
        res = 0;
        front = -1;
        for (int i = 0; i < str.length(); ++i) {
            it = dict.find(str[i]);
            if (front == dict.find(str[i])->second) res += 2;
            int tmp = dict.find(str[i])->second;
            while (tmp == it->second) {
                ++ res;
                -- it;
            }
            front = tmp;
        }
        cout << res << endl;
    }

    return 0;
}