Simple Math Expression Evaluator

Given a mathematical expression consisting of non-negative integers and the operators + and -, calculate its result. The expression is provided as a single string without any spaces.

Specifically, the arithmetic expression is of the form:

\(n_1 \pm n_2 \pm n_3 \pm \cdots \pm n_k\)

Process the expression from left to right to compute the answer.

inputFormat

The input consists of a single line which is a string representing the arithmetic expression (only digits with '+' and '-' operators).

outputFormat

Output a single integer which is the result of evaluating the expression.

3+2

5