using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
 
public class Test
{
	public static void Main()
	{
		var content = "test1\n\nabcdocean123 \n\n\ntest2\ntest3";
		var lines = content.Split(new[] { "\n" }, StringSplitOptions.None)
                    .Select(line => line.Contains("ocean") ? $"{line}water" : line);
        Console.WriteLine(string.Join("\n", lines));
	}
}

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