using System;

public class Test
{
    static Func<int, int, bool> ConstructRelation(string s)
    {
        switch (s)
        {
            case ">":  return (Func<int, int, bool>)((a, b) => a > b);
            case "<":  return (Func<int, int, bool>)((a, b) => a < b);
            case "==": return (Func<int, int, bool>)((a, b) => a == b);
            case ">=": return (Func<int, int, bool>)((a, b) => a >= b);
            case "<=": return (Func<int, int, bool>)((a, b) => a <= b);
            default: throw new ArgumentException("Unknown relation");
        }
    }
	
	public static void Main()
	{
        Func<int, int, bool> rel = ConstructRelation(">");
        Console.WriteLine(rel(5, 4)); // выводит True
	}
}