On the Subject of Subtraction

Honestly, this is literally just subtracting 3 digit numbers. Is the answer most of the time zero?

Use the gray ‘S’ button to cycle through 10 numbers, the red ‘C’ button to clear your input, and the ‘−’ button to submit the input.

Take the first 3-digit number as the current value. For every 3-digit number after this, subtract this number from the current value. If the current value at any point is negative, make it positive before continuing. After subtracting the other 9 numbers, the current value will be the value to submit.

Notes:

• The input display can only have a maximum of 3 digits.
• The first number in the cycle is ALWAYS colored gray.
• Incorrect submissions will result in a strike and reset the module with, most likely, 10 new numbers.