using System;
using System.Linq;
public class Program
{
public static void Main()
var boys = new[] { "Саша", "Петя", "Вася", "Аня", "Валя", "Катя", "Витя", "Максим", "Александр", "Пашааааа" };
Console.WriteLine(boys.OrderByDescending(name => name.Count(ch => ch == 'а')).First());
}