using System;

public class Program {
	public void Solve() {
		char[] c = Console.ReadLine().ToCharArray();
		char[] min = {'m', 'i', 'n'};
		int index = 0;
		int count = 0;
		for (int i = 0; i < c.Length; i++) {
			if (c[i].Equals(min[index])) {
				index++;
				if (index == min.Length) {
					index = 0;
					count++;
				}
			} else if (!(c[i].Equals('-') && index == 2)) {
				index = 0;
			}
		}
		Console.WriteLine(count);
	}
	
	public static void Main(string[] args) {
		Program program = new Program();
		program.Solve();
	}
}