Showing numbers greater than which are specified by the user in a multiplication table

Basically I've got to write a program which generates a 10 ×10 multiplication table, but only shows those entries which are greater than a value entered by the user (such as 50, but obviously I need to test a number of other ones). Entries which are less than or equal to this value should be replaced by a user-determined character. I've got no idea how to do this, I have the code to generate a 10x10 table which is below, I appreciate any help!

            public static void main(String[] args) {
        int tableSize = 10;
        printMultiplicationTable(tableSize);
    }

    public static void printMultiplicationTable(int tableSize) {

        System.out.println("Please enter a letter");
        Scanner sc = new Scanner(System.in);
        char letter = sc.next().charAt(0);


        System.out.println("Please enter a number");
        Scanner sc1 = new Scanner(System.in);
        int num = sc1.nextInt();

        System.out.format("      ");
        for(int i = 1; i<=tableSize;i++ ) {
            System.out.format("%4d",i);
        }
        System.out.println();
        System.out.println("-------------------------------------------"
                + "---");

        for(int i = 1 ;i<=tableSize;i++) {

            System.out.format("%4d |",i);
            for(int j=1;j<=tableSize;j++) {
                if(i*j > num) {
                    System.out.format("%4d",i*j);
                }
                else {
                   System.out.format("%4d",letter);
                }

            System.out.println();
        }}}}