Space Station Establishment

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

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

        int n = Integer.parseInt(scanner.nextLine());
        char[][] matrix = new char[n][];
        for (int i = 0; i < n; i++) {
            matrix[i] = scanner.nextLine().toCharArray();
        }
        int rowStart = 0;
        int colStart = 0;
        List<Integer> hole = new ArrayList<>();
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[i].length; j++) {
                if (matrix[i][j] == 'S') {
                    rowStart = i;
                    colStart = j;
                }
                if (matrix[i][j] == 'O') {
                    hole.add(i);
                    hole.add(j);
                }
            }
        }
        int rowHoleOne = -1;
        int colHoleOne = -1;
        int rowHoleTwo = -1;
        int colHoleTwo = -1;
        if (hole.size() > 0) {
            rowHoleOne = hole.get(0);
            colHoleOne = hole.get(1);
            rowHoleTwo = hole.get(2);
            colHoleTwo = hole.get(3);
        }
        int starsEnerjy = 0;
        int outOfGalaxy = 0;
        while (starsEnerjy < 50 && outOfGalaxy == 0) {
            String move = scanner.nextLine();
            matrix[rowStart][colStart] = '-';
            switch (move) {
                case "up":
                    rowStart--;
                    if (rowStart < 0) {
                        outOfGalaxy = 1;
                    }
                    break;
                case "down":
                    rowStart++;
                    if (rowStart == matrix.length) {
                        outOfGalaxy = 1;
                    }
                    break;
                case "left":
                    colStart--;
                    if (colStart < 0) {
                        outOfGalaxy = 1;
                    }
                    break;
                case "right":
                    colStart++;
                    if (colStart == matrix.length) {
                        outOfGalaxy = 1;
                    }
                    break;
            }
            if (outOfGalaxy > 0) {
                System.out.println("Bad news, the spaceship went to the void.");
                System.out.printf("Star power collected: %d", starsEnerjy);
                System.out.println();
                printMatrix(matrix);
                return;
            }

            if (matrix[rowStart][colStart] == 'O') {
                if (matrix[rowStart][colStart] == matrix[rowHoleOne][colHoleOne]) {
                    matrix[rowStart][colStart] = '-';
                    rowStart = rowHoleTwo;
                    colStart = colHoleTwo;
                } else if (matrix[rowStart][colStart] == matrix[rowHoleTwo][colHoleTwo]) {
                    matrix[rowStart][colStart] = '-';
                    rowStart = rowHoleOne;
                    colStart = colHoleOne;
                }

            } else if (Character.isDigit(matrix[rowStart][colStart])) {
                starsEnerjy += (matrix[rowStart][colStart]) - '0';
            }

        }


        matrix[rowStart][colStart] = 'S';
        System.out.println("Good news! Stephen succeeded in collecting enough star power!");
        System.out.printf("Star power collected: %d", starsEnerjy);


        System.out.println();
        printMatrix(matrix);


        //        System.out.println(matcher.toString().replaceAll("[\\[\\],]", ""));

    }

    private static void printMatrix(char[][] matrix) {
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[i].length; j++) {
                System.out.print(matrix[i][j]);
            }
            System.out.println();
        }
    }
}