#include <cstdio>
#include <algorithm>
#include <cstring>
#include <string>
#include <vector>

using namespace std;

const int inf=1e9;
const vector<string> tast={"QWERTYUIOP","ASDFGHJKL","ZXCVBNM"};
pair<int,int> poz[200];
int d[110][30][30];
char sir[110];

int dist(int a,int b)
{
    return abs(poz[a].first-poz[b].first)+abs(poz[a].second-poz[b].second);
}

int main()
{
    //freopen("file.in", "r", stdin);
    //freopen("file.out", "w", stdout);
    for(int i=0;i<3;i++)
        for(int j=0;j<tast[i].size();j++) poz[tast[i][j]-'A']={i,j};
    scanf("%s",sir+1);
    int n=strlen(sir+1);
    for(int i=0;i<=n;i++)
        for(int j=0;j<26;j++)
            for(int k=0;k<26;k++) d[i][j][k]=inf;
    d[0]['F'-'A']['J'-'A']=0;
    for(int i=1;i<=n;i++)
    {
        for(int j=0;j<26;j++)
            for(int k=0;k<26;k++)
            {
                d[i][j][sir[i]-'A']=min(d[i][j][sir[i]-'A'],d[i-1][j][k]+dist(k,sir[i]-'A'));
                if(d[i][j][sir[i]-'A']<inf)
                {
                    int a=0;
                    a++;
                }
                d[i][sir[i]-'A'][j]=min(d[i][sir[i]-'A'][j],d[i-1][k][j]+dist(k,sir[i]-'A'));
            }
    }
    int sol=inf;
    for(int i=0;i<26;i++)
        sol=min(sol,min(d[n][sir[n]-'A'][i],d[n][i][sir[n]-'A']));
    printf("%d",sol);
    return 0;
}