import java.util.*;

public class Exercise153 {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    int count = 0;

    String str = sc.next();
    str = str.replace("-", "");

    String[] strarray = str.split("m");

    for(String letter: strarray){
      if(letter.equals("in")){
        count++;
      }
    }
     System.out.println(count);
  }
}