ya_ex1

ex1.cs

using System;

using System.Linq;
using System.Text;
using System.Collections.Generic;
using System.Text.RegularExpressions;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string line;
            

            System.IO.StreamReader file = new System.IO.StreamReader("input.txt");

            var wordsCount = Int32.Parse(file.ReadLine());

            string[] lines = new string[wordsCount];

            int i = 0;

            while ((line = file.ReadLine()) != null)
            {
                lines[i] = line;
                i++;
            }

            file.Close();

            int length = lines[0].Length;
            string result = "";

            for(i = 0; i < length; i++ )
            {
                Dictionary<char, int> values = new Dictionary<char, int>();
                for(int j = 0; j < wordsCount; j++)
                {
                    if (values.ContainsKey(lines[j][i]))
                        values[lines[j][i]] += 1;
                    else
                        values.Add(lines[j][i], 1);
                } 
                result += (from x in values where x.Value == values.Max(v => v.Value) select x.Key).First(); 
            }


            Console.WriteLine(result);

            Console.ReadLine();
        }

    }
}