Compiler unfinished

package zz;

import java.util.Scanner;

public class ZZ {

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

        String Letters = "a b c d e f g h i j k l m n o p q r s t u v w x y z";
        String symbols = ", . / ; ' ` ! @ # $ % ^ & * ( ) [ ]";
        String numbers = "1 2 3 4 5 6 7 8 9 0";
        System.out.println("Input String");
        String mystring1 = scan.nextLine();
       String[] arrString = mystring1.split(" ");
       String[] arrNumber = numbers.split("");

       char[] charletters = Letters.toCharArray();
       // char[] charString = mystring1.toCharArray();
           int p = 0;
        for (String y : arrString){
             char[] charString = y.toCharArray();
            if ("if".equals(y.toLowerCase())){
                System.out.println( "Token name: if");
            }else if ("then".equals(y.toLowerCase())){
                System.out.println( "Token name: then");
            }else if("else".equals(y.toLowerCase())){
                System.out.println( "Token name: else");
             }else{
             for(int a = 0; a < y.length(); a++){
                 for(int z = 0; z < charletters.length; z++)
                 if (charString[p] == charletters[z]){
                     System.out.println("Token name: ID");
                     z = charletters.length;
                     a = y.length();
                 }
             }
             }



            }
           // System.out.println(y);

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

    }

/*
            for (char x : charString){

                if( x == charletters[p])
                    System.out.println( x + " = " + "letters");
                }
            p++;
*/