02.WeirdScript

package com.company;

import java.util.Arrays;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class _02WeirdScript26Oct15 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        int n = scan.nextInt();

        if (n >= 52) {
            n %= 52;
        }

        if (n <= 26) {
            n += 'a' - 1;
        } else {
            n += 'A' - 27;
        }

        String text = scan.nextLine();
        String key = (char) n + "" + (char) n;

        String fullText = "";

        while (!text.equals("End")) {
            fullText += text;

            text = scan.nextLine();
        }

        String patternText = key + "(.*?)" + key;

        Pattern pattern = Pattern.compile(patternText);
        Matcher matcher = pattern.matcher(fullText);

        while (matcher.find()) {
                System.out.println(matcher.group(1));


            }
        }
    }