Two strings - use hashset - more efficient

TwoStrings2.cs

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

namespace hacker_rank
{
    class Solution
    {
        static void Main(string[] args)
        {
            var n = int.Parse(Console.ReadLine());
            for (var i = 0; i < n; i++)
            {
                var a = Console.ReadLine();
                var b = Console.ReadLine();
                var aChars = new HashSet<char>(a.ToList());
                var bChars = b.ToList();
                if (bChars.Any(c => aChars.Contains(c)))
                {
                    Console.WriteLine("YES");
                }
                else
                {
                    Console.WriteLine("NO");
                }
            }
        }
    }
}

June 16, 2016
Review HashSet constructor - IEnumerable collection, read example code:
https://msdn.microsoft.com/en-us/library/bb301504(v=vs.110).aspx
Any - HashSet extension method LINQ - set operation - Any