using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        string foo = "ProcessFlowPFDiagram";

        Console.WriteLine(Test(foo));

​

    }

    public static string Test(string foo)

    {

        StringBuilder result = new StringBuilder();

        foreach (char c in foo)

        {

            if (result.Length >= 2)

            {

                break;

            }

            else if (char.IsUpper(c))

            {

                result.Append(c);

            }           

        }

        return result.ToString();

    }

}