using System;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
		string mystring = "A\nB\nC\nD\nE\nF\nG\n";
		var result = Regex.Replace(mystring.Replace("\n", ""), ".{5}", "$0|");
		Console.WriteLine(result);
	}
}