using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Text.RegularExpressions;

class MatchFullName
{
    static void Main()
    {
        string input = "ivan ivanov, Ivan ivanov, ivan Ivanov, IVan Ivanov, Ivan IvAnov, Ivan	Ivanov, Ivan	IvanOV";
        string pattern = @"\b[A-Z][a-z]+\s[A-Z][^A-Z][a-z]+\b";
        Regex regex = new Regex(pattern);
        MatchCollection matches = regex.Matches(pattern);

        foreach (MatchCollection match in matches)
        {
            Console.Write(matches + " ");
        }
    }
}