public Field() {
        Point[][] res = new Point[FIELD_SIZE][FIELD_SIZE];
        Scanner sc = new Scanner(System.in);
        char letter;
        while (true) {
            System.out.println("Please, enter one letters from matrix:");
            for (int i = 0; i < FIELD_SIZE; i++) {
                for (int j = 0; j < FIELD_SIZE; j++) {
                    try {
                        System.out.println("a[" + i + "][" + j + "] = ");
                        letter = sc.next().charAt(0);
                        res[i][j] = new Point(letter, i, j);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
            for (int i = 0; i < FIELD_SIZE; i++) {
                for (int j = 0; j < FIELD_SIZE; j++) {
                    System.out.print(res[i][j].getLetter());
                }
                System.out.println();
            }
            System.out.println("Matrix is OK? (y/n)");
            letter = sc.next().charAt(0);
            if (letter == 'y'){
                this.points = res;
                return;
            }
        }
    }