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class ReverseNumber {
    public static void main(String[] args) {
        int input = 123;
        int r, output = 0;

        while (input > 0) {
            r = input % 10;
            input = input / 10;
            output = output * 10 + r;
        }

        System.out.println("Original Number : " + input);
        System.out.println("Reverse Number : " + output);
    }
}