I am a 4-digit number less than 2000. The digit in the ones place is 4 more than the digit in the tens place. The digit in the tens place is 1 less than the digit in the hundreds place. The digit in the hundreds place stands for 600. <hr> I am <input min="0" type="number" id ="imp3pg013q3_1" class="lineinput" placeholder="?" />