#include <iostream>

using namespace std;

const int MAX_N = 110;
const int INF = (1 << 30);

const char keyboard[3][11] = {"QWERTYUIOP", "ASDFGHJKL ", "ZXCVBNM   "};

int dist[26][26];

int d[110][26][26];

int main()
{
  for(int i = 0; i < 3; i++) {
    for(int j = 0; j < 10; j++) {
      for(int i2 = i; i2 < 3; i2++) {
        for(int j2 = j; j2 < 10; j2++) {
          if(keyboard[i][j] != ' ' && keyboard[i2][j2] != ' ') {
            dist[keyboard[i][j] - 'A'][keyboard[i2][j2] - 'A'] =
             dist[keyboard[i2][j2] - 'A'][keyboard[i][j] - 'A'] =
              i2 - i + j2 - j;
          }
        }
      }
    }
  }

  string s;
  cin >> s;
  int n = s.size();

  for(int i = 0; i <= n; i++) {
    for(int t1 = 0; t1 < 26; t1++) {
      for(int t2 = 0; t2 < 26; t2++) {
        d[i][t1][t2] = INF;
      }
    }
  }

  d[0]['F' - 'A']['J' - 'A'] = 0;
  for(int i = 0; i < n; i++) {
    for(int t1 = 0; t1 < 26; t1++) {
      for(int t2 = 0; t2 < 26; t2++) {
        d[i + 1][t1][s[i] - 'A'] = min(d[i + 1][t1][s[i] - 'A'], d[i][t1][t2] + dist[t2][s[i] - 'A']);
        d[i + 1][s[i] - 'A'][t2] = min(d[i + 1][s[i] - 'A'][t2], d[i][t1][t2] + dist[t1][s[i] - 'A']);
      }
    }
  }

  int ans = INF;
  for(int i = 0; i < 26; i++) {
    for(int j = 0; j < 26; j++) {
      ans = min(ans, d[n][i][j]);
    }
  }

  cout << ans;

  return 0;
}