Find all words in a 2D array of characters

Problem

Given a 2D array of characters, find all the words in the array.
Input:
[['a','b','c','d'],
 ['e','f','g','h'],
 ['i','j','k','l'],
 ['m','n','o','p']]
Output:
["abcd", "efgh", "ijkl", "mnop"]

Solution

This solution is in C#. Our A.I. can create solutions in multiple languages.

kayakane

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            char[,] input = new char[4, 4] { { 'a', 'b', 'c', 'd' }, { 'e', 'f', 'g', 'h' }, { 'i', 'j', 'k', 'l' }, { 'm', 'n', 'o', 'p' } };
            List<string> output = new List<string>();
            for (int i = 0; i < input.GetLength(0); i++)
            {
                StringBuilder sb = new StringBuilder();
                for (int j = 0; j < input.GetLength(1); j++)
                {
                    sb.Append(input[i, j]);
                }
                output.Add(sb.ToString());
            }
            Console.WriteLine(string.Join(",", output ));
            Console.ReadLine();
        }
    }
}