import java.util.*;

public class Main{
  public static void main(String[] args){
    int i, count = 0;
    Scanner sc = new Scanner(System.in);
    String input = sc.next();
    if(input.charAt(input.length()-1) != 'n')count--;
    String[] line = input.split("n");
    for(i=0;i<line.length;i++){
      if(line[i].matches("mi-*"))count++;
    }
    System.out.println(count);
  }
}