import java.util.*;
import java.util.regex.*;

public class Main {
    private static Scanner sc = new Scanner(System.in);
    public static void main(String[] args) throws Exception {
        String s = sc.next();
        Pattern p = Pattern.compile("mi-*n");
        String ret = p.matcher(s).replaceAll("-");
        
        System.out.println(ret.length());
    }
}