using System;

public class Program

{

static int eE=1;

static int xX=2;

static int iI=3;

static int tT=4;

static int s=0;

static String input=String.Empty;

static char[] letterarray;

​

    public static void Main()

    {

        int i=0;

        resetInput();

        letterarray=input.ToCharArray();

        while(i<input.Length){

            char letter = letterarray[i];

            i++;

            if (s==0  && (letter=='e' || letter=='E'))

                s=eE;

            else if( s==eE && (letter=='x' || letter=='X'))

                s=xX;   

            else if (s==xX && (letter=='i' || letter=='I'))

                s=iI;   

            else if (s==iI &&  i==input.Length && (letter=='t' || letter=='T')){

                s=tT;

                Console.WriteLine("exit found"  );

                break;

            }

            else{

                resetInput();

                i=0;

            }

​

        }

​

    }

    public static void resetInput(){

        s=0;

        Console.WriteLine("Enter String: ");

        input = Console.ReadLine();

        letterarray=input.ToCharArray();

    }

}