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

#define SZ(a) (int)a.size()
#define ALL(a) a.begin(), a.end()
#define FOR(i, a, b) for (int i = (a); i<(b); ++i)
#define RFOR(i, b, a) for (int i = (b)-1; i>=(a); --i)
#define MP make_pair
#define PB push_back
#define F first
#define S second

typedef long long LL;
typedef pair<int, int> PII;
typedef vector<int> VI;

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	
	vector<char> v = {'c', 'd', 'h', 's'};
	string s;
	cin >> s;
	int ans = SZ(s);
	do
	{
		VI dp(4, 0);
		FOR(i, 0, SZ(s))
		{
			int j = 0;
			while (s[i] != v[j]) j++;
			dp[j]++;
			FOR(k, j, 4) dp[k] = max(dp[k], dp[j]);
		}
		ans = min(ans, SZ(s) - *max_element(ALL(dp)));		
	}while (next_permutation(ALL(v)));
	cout << ans << '\n';
	return 0;
}