using System;
using System.Collections.Generic;
public class Program
{
public static void Main()
string hostName = "B1";
var buildings = new Dictionary<string, string>
{ "B1", "Building 1" },
{ "B2", "Building 2" },
{ "B3", "Building 3" },
{ "B4", "Building 4" }
};
if (buildings.ContainsKey(hostName))
Console.Write(buildings[hostName]);
}
else
Console.Write("Error!");