Robot on a Line

Difficulty: 800 2000 ms 128 MB

implementation

A robot starts at position 0 on a number line and follows a command string: L moves it one step left, R one step right. Where does it end?

Input: one line with the command string S.

Output: the final position.

Constraints:

• 1 ≤ |S| ≤ 10⁵

Sample Tests

RRL

1

LLL

-3

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