using System.Collections.Generic;
using System.Text.RegularExpressions;
public static void Main()
string aString = "JPL3UE1F--NK78-L2QW-34T";
IEnumerable<char> stringQuery =
foreach (char c in stringQuery)
int count = stringQuery.Count();
Console.WriteLine(" --- So ky tu la so = {0}", count);
IEnumerable<char> stringQuery2 = aString.TakeWhile(c => c != '-');
foreach (char c in stringQuery2)
Console.WriteLine(System.Environment.NewLine + "Nhan bat ky phim nao de thoat!");