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  1. using System.IO;
  2. using System;
  3. using System.Collections.Generic;
  4. using System.Linq;
  5.  
  6. class Program
  7. {
  8.     static void Main()
  9.     {
  10.         List<string> list1 = new List<string> { "A", "C", "F", "H", "I" };
  11.         List<string> list2 = new List<string> { "B", "D", "F", "G", "L" };
  12.         String sel = list1.Intersect(list2).FirstOrDefault()??"";
  13.  
  14.         Console.WriteLine(sel);
  15.  
  16.     }
  17. }
Success #stdin #stdout 0.03s 33944KB
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https://ideone.com/G2js8c
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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