public static void separateNumbers(string s)
{
    var print = "NO";

    if (s.Length > 1)
    {
        var sequenceStart = string.Empty;

        for (int i = 0; i < s.Length / 2; i++)
        {
            sequenceStart += s[i];
            var num = long.Parse(sequenceStart);
            var sequence = string.Empty;

            while (s.Length > sequence.Length)
            {
                if (!s.StartsWith(sequence)) break;

                sequence += num;
                ++num;
            }

            if (s.StartsWith(sequence))
            {
                print = $"YES {sequenceStart}";
            }

            if (s.Length == sequence.Length) break;
        }
    }

    Console.WriteLine(print);
}