#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (int)(n); ++i)

int main(){
    string s;
    cin >> s;
    s.erase(remove(s.begin(), s.end(), '-'), s.end());
    int ans = 0;
    rep(i,s.size()-2) if(s.substr(i,3) == "min") ++ans;
    cout << ans << endl;
}