Encrypter #2

import java.io.*;
public class GooseSalam_Encrypter
{
    public static void main()throws IOException
    {
        InputStreamReader read = new InputStreamReader(System.in);
        BufferedReader in = new BufferedReader(read);
        boolean baba=false;
        long name=1;
        do
        {
            String sent="",cord="";
            System.out.print("\u000c");
            System.out.println("-----------------------------------------------------");
            System.out.println("Welcome to the code generator. What do you wanna do? |");
            System.out.println("-----------------------------------------------------");
            System.out.println(" ---->Transform a sentence to a code\tEnter transform");
            System.out.println("");
            System.out.println(" ---->Decode a code sentence        \tEnter Decode");
            System.out.println("");
            char wtd= ((in.readLine()).toUpperCase()).charAt(0);
            if(wtd=='T')
            {
                System.out.println("Enter the sentence to be transformed. (EVERTHING MUST BE CAPS)");
                sent=in.readLine();
                cord=encrypt(sent);
                System.out.println(" *****Transformation completed!! The code is: *****");
                System.out.println(cord);
            }
            else if(wtd=='D')
            {
                System.out.println("Enter the sentence to be decoded. (EVERTHING MUST BE CAPS)");
                sent=in.readLine();
                cord=encrypt(sent);
                System.out.println(" *****Decoding completed!! The code is: *****");
                System.out.println(cord);
            }
            else
            {
                System.out.println("Sorry, enter something valid!!");
            }
            System.out.println("Repeat the program??\t\t\t    Y/N/y/n/yep/yeah/no/yes/nope/neva");
            char yn=in.readLine().charAt(0);
            if(yn=='Y'||yn=='y')
            {
                name++;
                baba=true;
            }
            else
                baba=false;
            System.out.print("\u000c");
        }
        while(baba);
        System.out.println("You have used this program "+name+" times.");
        System.out.println("Thanks for using this program.");
    }

    private static String encrypt(String sent)
    {
        sent=sent.toUpperCase();
        char a[]=new char[26];
        char b[]=new char[26];int k=65;
        String news="";
        for(int i=0;i<26;i++,k++)
            a[i]=(char)k;
        k=(int)'N';
        for(int i=0;i<13;i++,k++)
            b[i]=(char)k;
        k=(int)'A';
        for(int i=13;i<26;i++,k++)
            b[i]=(char)k;
        for(int i=0;i<sent.length();i++)
        {
            char t=sent.charAt(i);
            if(Character.isLetter(t))
            {
                for(int j=0;j<=25;j++)
                    if(t==a[j])
                        news=news+b[j];
            }
            else
                news=news+t;
        }
        return news;
    }
}