using System; 
using System.Text.RegularExpressions; 
 
class Program 
{ 
    static void Main() 
    { 
        string input = "Blabla 11/moreBla 17-18"; 
        string[] s = input.Split('/'); 
        Console.WriteLine(Regex.Replace(s[0], @"[^\d]", "") + "." + Regex.Replace(s[1], @"[^\d]", "")); 
    } 
}