import java.util.Scanner;

class Exam {
    
    
    public static void main(String[] args) {
        
        
        Scanner input=new Scanner(System.in);
        
        System.out.println("Enter the number of letters :");
        
        int size=input.nextInt();//

        char [] letters=new char[size];
        
        
        
        System.out.println("enter the letters : " );

            for(int x=0 ;  x<letters.length;  x++){

           letters[x]=input.next().charAt(0);
    }
        
        
            
            
int choice=0;


while(choice!=3){


System.out.println("\nWhat would you like to do ?");
System.out.println("1. Check letter if it is avilabe or not ");
System.out.println("2. Display all letters ");
System.out.println("3. Exit.");
System.out.print("Your choice is :");


choice=input.nextInt();



switch (choice){

case 1 :

 System.out.println("Enter a letter to check : ");
           
 char  letter=input.next().charAt(0);
           
System.out.println((check(letter,letters)==1?"The Letter is Availabe":"The Letter is NOT Availabe"));

break;

case 2 : 

for(char  x : letters){
System.out.println(x);
}


break;

case 3 : break;

default :  System.out.println("Invalid Choice !");
}






}
   
            
    }//end main
    
    
    
        public static  int check(char  letter  ,  char[] letters){

        int  isFound=0;


        for(int x=0 ; x<letters.length;x++){

        if(letter==letters[x])
         isFound=1;

        }


        return   isFound;

        }
    

}