using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
var s = "09123456789";
if (s.Length == 11 && s.StartsWith("09") && s.All(Char.IsDigit))
Console.WriteLine("Valid!");
}
}
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