using System;

using System.IO;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var inputLines = "a,b,c|AA,CC,KLK|A,kkdf,sdfsdf|asdasfdadsfds,shshd,l".Split('|').ToList();

        Dictionary<int,int> dictIndexLenght = new Dictionary<int,int>();

        foreach(var line in inputLines)

        {

            List<string> columList =  line.Split(',').ToList();

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

            {

                int tempVal = 0;

                if(dictIndexLenght.TryGetValue(i,out tempVal))

                {

                    if(tempVal<columList[i].Length)

                    {

                        dictIndexLenght[i]=columList[i].Length;

                    }                  

                }

                else

                    dictIndexLenght[i]=columList[i].Length;

            }

        }

​

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

        {

            Console.WriteLine("{0} : {1}", i, dictIndexLenght[i]);

        }   

    }

}