UVA - 619 - Numerically Speaking

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigInteger;

public class Main {

    public static void main(String[] args) throws IOException { 
        InputStreamReader isr = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(isr);
        StringBuilder sb = new StringBuilder("");
        int[] x=new int[27];
        for(int i=1;i<27;i++){
            x[i]=i;
        }
        String m="";
        while(true){
            String ansS="";
            String ansN="";
            m=br.readLine();
            if("*".equals(m))
                break;
            if(m.charAt(0)>='0' && m.charAt(0)<='9'){
                ansS=bigInttoString(new BigInteger(m));
                ansN=m;
            }else{
                ansS=m;
                ansN=stringtoBigInt(m, x).toString();
            }
            ansN=addComas(ansN);
            sb.append(ansS);
            for(int i=ansS.length();i<22;i++){
                sb.append(" ");
            }
            sb.append(ansN).append("\n");
        }
        System.out.print(sb);
    }
   
    static BigInteger stringtoBigInt(String x,int []arr){
        BigInteger temp= BigInteger.ZERO;
        for(int i=0;i<x.length();i++){
            int index=x.charAt(i)-96;
            if(index>0 && index<27)
                temp=temp.add(BigInteger.valueOf(index).multiply(BigInteger.valueOf(26).pow(x.length()-i-1)));
        }
        return temp;
    }
   
    static String bigInttoString(BigInteger x){
        StringBuilder sb= new StringBuilder("");
        BigInteger bg=x;
        while (bg.compareTo(BigInteger.ZERO)>0){
            BigInteger lol=bg.mod(BigInteger.valueOf(26));
            int sim=lol.intValue();
            bg=bg.divide(BigInteger.valueOf(26));
            char c=(char) (lol.intValue()+96);
            sb.append(c);
        }
        return sb.reverse().toString();
    }
   
    static String addComas(String x){
        StringBuilder sb=new StringBuilder("");
        for(int i=x.length()-1,index=1;i>0;i--,index++){
            sb.append(x.charAt(i));
            if(index%3==0)
                sb.append(",");
        }
        sb.append(x.charAt(0));
        return sb.reverse().toString();
    }
}