using System.Text.RegularExpressions;
public static void Main()
string text = Console.ReadLine();
string pattern = @"(<p>(.*?)<\/p>)";
Regex regexp = new Regex(pattern);
MatchCollection matches = regexp.Matches(text);
foreach(Match match in matches)
extract += match.Groups[2].ToString();
string replPattern = @"([^a-z0-9])";
Regex regex = new Regex(replPattern);
extract = Regex.Replace(extract, replPattern," ");
extract = Regex.Replace(extract, @"\s+|\n+"," ");
StringBuilder sb = new StringBuilder(extract.Length);
foreach(char ch in extract)
if(ch >= 'a' && ch <= 'm')
sb.Append((char)(ch + 13));
else if(ch >= 'n' && ch <= 'z')
sb.Append((char)(ch - 13));
string result = sb.ToString();
Console.WriteLine(result);