import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

/**
 * Created by spenteleiciuc on 4/6/2017.
 */
public class prog {
    public static void main(final String[] args) {
        Scanner scan = new Scanner(System.in);
        String line = scan.next();

        String line1 = "QWERTYUIOP";
        String line2 = "ASDFGHJKL ";
        String line3 = "ZXCVBNM";

        Map<Character, Integer> charToLong = new HashMap<Character, Integer>();
        Map<Character, Integer> charToLat = new HashMap<Character, Integer>();

        for(int i = 0; i < line1.length(); i++) {
            charToLong.put(line1.charAt(i), 0);
            charToLat.put(line1.charAt(i), i);
        }
        for(int i = 0; i < line2.length(); i++) {
            charToLong.put(line2.charAt(i), 1);
            charToLat.put(line2.charAt(i), i);
        }
        for(int i = 0; i < line3.length(); i++) {
            charToLong.put(line3.charAt(i), 2);
            charToLat.put(line3.charAt(i), i);
        }

        StringBuilder sb = new StringBuilder();

        int sum = 0;
        int sLong1 = 1;
        int sLat1 = 3;

        int sLong2 = 1;
        int sLat2 = 6;


        for(int i = 0; i < line.length(); i++) {
            int fLong = charToLong.get(line.charAt(i)).intValue();
            int fLat = charToLat.get(line.charAt(i)).intValue();
            int distance1 = Math.abs(fLat-sLat1) + Math.abs(sLong1-fLong);
            int distance2 = Math.abs(fLat-sLat2) + Math.abs(sLong2-fLong);
            if (distance1 < distance2) {
                sum += distance1;
                sLong1 = fLong;
                sLat1 =fLat;
            } else {
                sum += distance2;
                sLong2 = fLong;
                sLat2 =fLat;
            }

        }

        System.out.println(sum);
    }
}