print this pattern

import java.util.Arrays;
import java.util.Comparator;

public class PrintThisPattern {
    private static final String input = "THIS IS A PEN";
    private char[][] matrix;

    public PrintThisPattern() {
        init().rotate().print();
    }

    public static void main(String[] args) {
        new PrintThisPattern();
    }

    private PrintThisPattern init() {
        String[] rows = Arrays.stream(input.split("\\s+"))
                .sorted(Comparator.comparing(String::length).reversed())
                .toArray(String[]::new);

        matrix = new char[rows.length][rows[0].length()];
        int line = 0;
        for (String row : rows) {
            char[] chars = row.toCharArray();
            for (int i = 0; i < matrix[line].length; i++) {
                matrix[line][matrix.length - i - 1] = i < chars.length ? chars[chars.length - i - 1] : ' ';
            }
            line++;
        }
        return this;
    }

    private PrintThisPattern rotate() {
        char[][] rotated = new char[matrix.length][matrix[0].length];
        for (int i = 0; i < rotated.length; i++) {
            for (int j = 0; j < rotated[0].length; j++) {
                rotated[i][j] = matrix[rotated.length - j - 1][i];
            }
        }
        matrix = rotated;
        return this;
    }

    private void print() {
        for (char[] row : matrix) {
            for (char c : row)
                System.out.print(c);
            System.out.println();
        }
    }
}