using System;
using System.Text;
using System.Text.RegularExpressions;
 
public class Test
{
	public static void Main()
	{
		string input = @"<p>1:4 Lorem ipsum dolor sit amet, consectetur adipisicing elit,</p>
<p>sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
<p>1:5 Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
<p>Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.</p>
<p>1:6 Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<p>And he answered, That the people are fled from the battle, and many of the people also are fallen and dead; and Saul and Jonathan his son are dead also.</p>";
 
    StringBuilder sb = new StringBuilder();
    foreach (string line in input.Split(new[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries))
    {
        // new paragraph
        if (Regex.IsMatch(line, @"^\<p\>[0-9]\:[0-9].+\</p\>$"))
        {
            sb.Append(line);
        }
        else // continuation
        {
            sb.Append(line);
            sb.AppendLine();
        }
    }
    string result = sb.ToString();
    Console.WriteLine(result);
	}
}

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