import java.util.Scanner;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;

class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String s = in.next();

        int min_count = 0;

        s = s.replaceAll("-", "");
        s = s.replaceAll("min", "a");

        for(int i=0; i<s.length(); i++) {
            if(s.charAt(i) == 'a') {
                min_count++;
            }
        }

        System.out.println(min_count);

        in.close();
    }
}