SoftUni - 5.5 Third Digit is 7?

//Write an expression that checks for given integer if its third digit from right-to-left is 7.

using System;

class ThirdDigit
{
    static void Main()
    {
        Console.Write("Enter number a = ");
        string numberA = Console.ReadLine();
        int a = int.Parse(numberA);
        int b = a / 100;
        int c = b % 10;

        if (c == 7)
        {
            Console.WriteLine("true");
        }
        else
        {
            Console.WriteLine("false");
        }
    }
}