Two strings - byte, Hashset, beautiful code

TwoString9.cs

using System;
using System.Collections.Generic;

class Solution
{
    struct Data
    {
        public string a;
        public string b;
    }

    static void Main(String[] args)
    {
        byte t = byte.Parse(Console.ReadLine());
        Data[] datas = new Data[t];
        for (int i = 0; i < t; i++)
        {
            datas[i] = new Data { a = Console.ReadLine(), b = Console.ReadLine() };
        }

        foreach (Data data in datas)
        {
            Console.WriteLine(CheckTwoStrings(data) ? "YES" : "NO");
        }
    }

    private static bool CheckTwoStrings(Data data)
    {
        HashSet<char> hashSet = new HashSet<char>(data.a);

        foreach (char c in data.b)
        {
            if (hashSet.Contains(c))
                return true;
        }

        return false;
    }
}