A One-Variable Language

Easy

A toy programming language has a single variable X, which starts at 0, and just four commands: - ++X and X++ add 1 to X; - --X and X-- subtract 1 from X. A program is an array of strings commands, run in order. Return the value of X once the whole program has run.

Example 1

commands=['X++', '--X', 'X--', 'X--'] → -2

0 → 1 → 0 → -1 → -2.

Example 2

commands=['++X', '++X', 'X++'] → 3

Three increments in a row: 0 → 1 → 2 → 3.

Example 3

commands=['X--'] → -1

Constraints

1 ≤ commands.length ≤ 100
Each command is one of "++X", "X++", "--X", "X--"

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Topics

Array String Simulation

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Input

commands=['X++', '--X', 'X--', 'X--']

Expected

-2

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