Plus-Minus Digits

Easy

You are given a positive integer number. Put signs in front of its digits starting from the leftmost one: the first digit gets a plus, the second a minus, the third a plus again, and so on, alternating. Return the sum of the digits with those signs.

Example 1

number=7302 → 2

(+7) + (−3) + (+0) + (−2) = 2.

Example 2

number=4 → 4

A single digit, taken with a plus sign.

Example 3

number=1919 → -16

1 − 9 + 1 − 9 = −16: the answer can be negative.

Constraints

1 ≤ number ≤ 10⁹

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Topics

Math

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Input

number=7302

Expected

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