/******************************************************************************

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*******************************************************************************/

using System;

public class HelloWorld {

 public  static void Main() {

    Console.WriteLine("enter 3 letter word");

    string mila = Console.ReadLine();

    string alefbet="אבגדהוזחטיכלמנסעפצקרשת";

    int count=0;

    for(int i =0; i<alefbet.Length;i++){

        if(mila[0]==alefbet[i]){

            continue;

        }

    else {

        count++;

    }

    if(mila[1]==alefbet[i]){

            continue;

        }

   else{

        count++;

    }

    if(mila[2]==alefbet[i]){

            continue;

        }

    else {

        count++;

    }   

    }

    Console.WriteLine("the amount of mistakes:" +count);

}

}

​