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

public class Test
{
 
	public static void Main()
	{ 
        var input = "dbo.xyx.v1.UserDefinedFunction";
        string[] tokens = input.Split('.');
        int midIndex = (tokens.Length - 1) / 2;
        IEnumerable<int> intermediateIndices = midIndex % 2 == 0
            ? new[] { midIndex }
            : new[] { midIndex, midIndex + 1 };
        string intermediate = string.Join(".", tokens.Where((t, i) => intermediateIndices.Contains(i)).ToArray());
        Console.Write(intermediate);
	}
}