#include <bits/stdc++.h>

using namespace std;

string s1 = "QWERTYUIOP",
       s2 = "ASDFGHJKL",
       s3 = "ZXCVBNM";

vector<string>s = {s1, s2, s3};

int x[666], y[666];

void go(int l)
{	int cont = 0;

	for (auto &i : s[l])
	{	x[i] = l;
		y[i] = cont;
		cont++;
	}
}
int mh(int XX, int YY, int X, int Y)
{	return abs(X - XX) + abs(YY - Y);
}
int main()
{
#ifndef ONLINE_JUDGE
	freopen("data.in", "r", stdin);
	freopen("data.out", "w", stdout);
#endif // ONLINE_JUDGE

	ios::sync_with_stdio(0);
	go(0), go(1), go(2);
	string s;
	cin >> s;
	int xf = x['F'], yf = y['F'];
	int xj = x['J'], yj = y['J'];
	int ans = 0;

	for (auto i : s)
	{	int curx = x[i], cury = y[i];

		if (mh(xf, yf, curx, cury) < mh(xj, yj, curx, cury))
		{	ans += mh(xf, yf, curx, cury);
			xf = curx, yf = cury;
		}
		else
		{	ans += mh(xj, yj, curx, cury);
			xj = curx, yj = cury;
		}

	}

	cout << ans;
}