#include <iostream>
#include <cstring>

using namespace std;
int X[300],Y[300];
char S[102];
int abs(int x)
{
    return max(x,-x);
}
int main()
{
    int a,b,n;
    X['Q'] = X['W']=X['E']=X['R']=X['T']=X['Y']=X['U']=X['I']=X['O']=X['P']=1;
    X['A'] = X['S'] = X['D'] = X['F'] = X['G'] = X['H'] = X['J'] = X['K'] = X['L'] = 2;
    X['Z'] = X['X'] = X['C'] = X['V'] = X['B'] =X['N'] = X['M'] = 3;
    Y['Q'] = Y['A'] = Y['Z'] = 1;
    Y['W'] = Y['S'] = Y['X'] = 2;
    Y['E'] = Y['D'] = Y['C'] = 3;
    Y['R'] = Y['F'] = Y['V'] = 4;
    Y['T'] = Y['G'] = Y['B'] = 5;
    Y['Y'] = Y['H'] = Y['N'] = 6;
    Y['U'] = Y['J'] = Y['M'] = 7;
    Y['I'] = Y['K'] = 8;
    Y['O'] = Y['L'] = 9;
    Y['P'] = 10;
    cin>>S;
    n = strlen(S);
char    l1 = 'J',l2 = 'F';
int i,sol=0;
    for(i=0;i<n;i++)
    {
        if(abs(X[S[i]]-X[l1])+abs(Y[S[i]]-Y[l1])<abs(X[S[i]] - X[l2])+abs(Y[S[i]]-Y[l2]))
        {
            sol+=abs(X[S[i]]-X[l1])+abs(Y[S[i]]-Y[l1]);
            l1 = S[i];
        }
        else
        {
            sol+=abs(X[S[i]] - X[l2])+abs(Y[S[i]]-Y[l2]);
            l2 = S[i];
        }
    }
    cout<<sol;
    return 0;
}