using System;
using System.Linq;

public class Test
{
	public static void Main()
	{
        string[] arrayEnglishMonth = { "JANUARY", "FEBRUARY", "MARCH", "APRIL", "MAY", "JUNE", "JULY", "AUGUST", "SEPTEMBER", "OCTOBER", "NOVEMBER", "DECEMBER" };
		
        var item = arrayEnglishMonth.First(c => c.StartsWith("AUG"));
        var index = Array.IndexOf(arrayEnglishMonth, item);
        Console.WriteLine(index);
	}
}