macOS Why doesnt the else statement work in this?

ACCEPT p_1 PROMPT 'Please enter an Interger between 1 and 100:'

DECLARE
  v_rank number;
	v_input	Popular_names.rank%TYPE := '&p_1';
  v_mname varchar2(20);
  v_fname varchar2(20);	
BEGIN
  SELECT rank
  INTO v_rank
  FROM Popular_names
	WHERE rank=v_input;
  IF v_input>= 1 and v_input<= 100 THEN
      DBMS_OUTPUT.PUT_LINE('Valid!');
  ELSE
    DBMS_OUTPUT.PUT_LINE('Invalid Number!');
END IF;
END;