using System;
using System.Collections.Generic;
using System.Linq;

class Program {
    static void Main() {
        var paths = new List<string[]> { new[] { \"20F\", \"21F\", \"70B\" } };
        var valid = paths.Select(p => p.Select(t => new { Tag = t, IdStr = new string(t.Where(char.IsDigit).ToArray()) }).ToList()).ToList();
        Console.WriteLine(\"Compiled\");
    }
}