using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
namespace Demo {
public class Program {
public static void Main(string []arg) {
string str = "The quick brown fox jumps over the lazy dog";
Console.WriteLine("{0}: \"{1}\" is pangram", checkPangram(str), str);
Console.ReadKey();
}
static bool checkPangram(string str) {
return str.ToLower().Where(ch => Char.IsLetter(ch)).GroupBy(ch => ch).Count() == 26;
}
}
}