Challenge 1

package project1;
import java.util.*;
public class LookNSay
{
  public static void main(String[] args)
  {
      String input,output=" ";                                    // taking integer input as String to avoid overflow or out of bounds exception
      int LengthOfSeries;
      int i=0,j=0,z=1,length;
      Scanner sc=new Scanner(System.in);
      System.out.println("Enter your starting number: ");
      input=sc.nextLine();                                        //taking the input number from user.
      System.out.println("Enter the length of number: ");
      LengthOfSeries=sc.nextInt();                                //taking length up to which the user wants the output to be displayed.
      length=input.length();                                      //length of entered input number.
      while(length<=LengthOfSeries)
      {
        char[] newinput=input.toCharArray();                      //taking the input in the form of character array
        length=input.length();
        if(length==1)
        {
            output="1"+newinput[0];
            System.out.println(output);
        }
        for(i=0;i<length-1;i++)
        {
         if(newinput[j]==newinput[j+1])
          z++;
         else
            {
             output=""+z+""+newinput[j];                          //here z is the number of times a particular digit occurs and is followed by the digit.
             z=1;
             }
         j++;
         if(j==(length-1))
         {
            output=output+""+z+""+newinput[j];                    // its thecondition when the iteration reaches to last digit.
            System.out.println(output);
         }
        }
       input=output;                                              // reinitialization of input so that in next next iteration the output is fed as input 
       length=input.length();                                     // and the loop continues till length is less than user defined length i.e, LengthOfSeries.
       j=0;
       z=1;
    }
  }  
}