class PlusMinusTest1 {
	public static void main(String args[]) {
		PlusMinus ob1 = new PlusMinus();
		String ssum, sminus;
		ssum = ob1.plus(50,30);
		sminus = ob1.minus(50,30);
		System.out.println(ssum);
		System.out.println(sminus);
	}
}	