using System;

public class Program

{

    public static void Main()

    {

        int colCount = 0; 

        string[][] strA = new string[][]{new string[] {"a", "b", "c"}, new string[] {"d"}, new string[] {}, new string[] {"e","f","g"}};

​

        foreach (var line in strA) 

        colCount = Math.Max(line.Length, colCount); 

​

        for (int c = 0; c < colCount; ++c) { 

            for (int r = 0; r < strA.Length; ++r) { 

                if (strA[r].Length > c) 

                    Console.WriteLine(strA[r][c]); 

            } 

        }

        Console.ReadLine();

    }

}