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

int i, j, it, k, dp[105][105], rs = 1e9 + 69 * 69 * 69;
char a[][30] = {"QWERTYUIOP", "ASDFGHJKL", "ZXCVBNM"};
string s;

int getDist(char x, char y) {
  int dx = 0, dy = 0;

  for(int i = 0; i < 3; ++i)
    for(int j = 0; a[i][j]; ++j)
      if(a[i][j] == x) {
        dx = i; dy = j; i = 1e9;
        break;
      }

  for(int i = 0; i < 3; ++i)
    for(int j = 0; a[i][j]; ++j)
      if(a[i][j] == y) {
        dx = abs(dx - i);
        dy = abs(dy - j);
        i = 1e9;
        break;
      }

  return dx + dy;
}

int main() {
  ios_base::sync_with_stdio(0);

  cin >> s;

  for(i = 0; i <= 100; ++i)
    for(j = 0; j <= 100; ++j)
      dp[i][j] = 1e9 + 69 * 69;

  s = "FJ" + s;

  dp[0][1] = 0;

  for(i = 0; i < s.size(); ++i)
    for(j = 0; j < s.size(); ++j) {
      if(i == s.size() - 1 || j == s.size() - 1) rs = min(rs, dp[i][j]);
      if(dp[i][j] > 1e9) continue;

      int next = max(i, j) + 1;
      if(next == s.size()) continue;

      dp[next][j] = min(dp[i][j] + getDist(s[next], s[i]), dp[next][j]);
      dp[i][next] = min(dp[i][j] + getDist(s[next], s[j]), dp[i][next]);
    }

  cout << rs << '\n';
          
  return 0;
}