using System;

    using System.Collections.Generic;               

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World222");

        string str1="123";

        string str2="12";

        char[] chararray1,chararray2;

        if(str1.Length>str2.Length)

        {

            chararray1=str1.ToCharArray();

            chararray2=str2.ToCharArray();

        }

        else

        {

            chararray1=str2.ToCharArray();

            chararray2=str1.ToCharArray();

        }

        int carry=0;

        int times=0;

        List<int> finllist=new List<int>();

        List<int> sumlist;

        for(int i=chararray2.Length-1;i>=0;i--)

        {

             sumlist=new List<int>();

            if(times>0)

                sumlist.Add(0);

            for(int j=chararray1.Length-1;j>=0; j--)

            {

            //  Console.WriteLine("carry--------------------------"+carry);

                int temp= (int) (chararray1[j]-'0')* (int) (chararray1[i]-'0')+carry;

                carry=0;

                //Console.Write("--------------------------"+temp);

                if(temp>=10)

                {

                    ///Console.WriteLine("Greater");

                    int val=temp%10;

                    sumlist.Add(val);

                    carry=temp/10;       

                    Console.WriteLine(carry+"Greater"+val);

                }

                else 

                {

                    //Console.WriteLine("lesser");

                    //int val=temp%10;

                    sumlist.Add(temp);

                    carry=0;

                    Console.WriteLine("lesser-"+temp);

                }

            }//loop 2

            if(times>0)

            {

            sumlist.Reverse();

            findsum();

            finllist=sumlist;

            }

            else

            {

                sumlist.Reverse();

                finllist=sumlist;

            }

            times++;

        }//forloop1

        for(int i=0;i<finllist.Count;i++)

        {

            Console.Write(finllist[i]);

        }

        void findsum()

        {

            for(int i=0;i<finllist.Count;i++)

            {

            Console.Write(finllist[i]);

            }

            Console.WriteLine("-");

            for(int i=0;i<sumlist.Count;i++)

            {

            Console.Write(sumlist[i]);

            }

                Console.WriteLine("-");

            int j=finllist.Count-1;

            int carry=0;

            for(int i=sumlist.Count-1;i>=0;i--)

            {

                int temp=sumlist[i]+finllist[j]+carry;

                Console.Write(sumlist[i]);

                if(j>=0)

                {

                        if(temp>=10)

                        {

                             int val=temp-10;

                             sumlist[i]=val;

                             carry=1;

                        }

                        else

                        {

                            Console.WriteLine(carry+"sum on less"+temp);

                             sumlist[i]=temp;

                            carry=0;

                        }

                }

                else

                {

                        if(temp>=10)

                        {

                             int val=temp-10;

                             sumlist[i]=val;

                             carry=1;

                        }

                        else

                        {

                             sumlist[i]=temp;

                                carry=0;

                            Console.WriteLine(carry+"sum off less"+temp);

                        }

                }

            }

        }

    }

}