using System;
using System.Linq;
using System.IO;
using System.Text.RegularExpressions;

class Program {
  static void Main(string[] args) {
    var usefulProjection_ = new Regex("[1-9]");
    args.SelectMany(s => File.ReadAllLines(s)).
      Where(s => usefulProjection_.IsMatch(s)).ToList().
      ForEach(s => Console.WriteLine(s));
  }
}