Messages - BasicSyntax

using System;
using System.Linq;
using System.Collections.Generic;


public class Program
{
	public static void Main()
	{
		string result = string.Empty;

		int n = int.Parse(Console.ReadLine());

		for (int i=0; i<n; i++)
		{
			int currNum = int.Parse(Console.ReadLine());
			string numAsString = currNum.ToString();
			int currNumLen = numAsString.Length;

			int mainDigit = currNum%10;

			int offset = (mainDigit-2)*3;

			if (mainDigit == 8 || mainDigit==9)
			{
				offset+=1;
			}

			int letterIndex = (offset + currNumLen -1);

			char symbol = (char)(letterIndex + 97);

			if (symbol<97)
			{
				symbol = ' ';
			}
			result += symbol;
		}

		Console.WriteLine(result);
	}
}