using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
public static void Main() {
string[] presidents = {"A", "Ar", "B", "Bu", "C", "Cleveland"};
IEnumerable sequence = presidents.Where(p => p.StartsWith("C"));
foreach (string s in sequence)
Console.WriteLine("{0}", s);
}
}