#include <bits/stdc++.h>
using namespace std;

int mem[150][30][30];

int n;
int dist[50][50];
vector<string> key(3);
string s;

int ret(int poz, int left, int right) {
    if(poz == n)
        return 0;

    if(mem[poz][left][right] >= 0)
        return mem[poz][left][right];

    int &ans = mem[poz][left][right];
    ans = 1e9;

    ans = min(ret(poz + 1, s[poz], right) + dist[left][s[poz]],
              ret(poz + 1, left, s[poz]) + dist[right][s[poz]]);
    
    return ans;
}

int main() {

    cin >> s;
    n = s.size();
    for(int i = 0; i < n; ++i)
        s[i] -= 'A';

    memset(mem, -1, sizeof(mem));
    
    key[0] = "QWERTYUIOP";
    key[1] = "ASDFGHJKL";
    key[2] = "ZXCVBNM";
    
    for(int i = 0; i < 3; ++i)
        for(int j = 0; j < int(key[i].size()); ++j)
            for(int k = 0; k < 3; ++k)
                for(int l = 0; l < int(key[k].size()); ++l)
                    dist[key[i][j] - 'A'][key[k][l] - 'A'] = abs(i - k) + abs(j - l);
    
    cout << ret(0, 'F'- 'A', 'J' - 'A') << "\n";
}