# Implement @try_this decorator here )
import queue
import threading
import time

DATA = {
    'name': 'MainCategory',
    'values': [
        {
            'name': 'Category1',
            'values': [2, 5, 6]
        }, {
            'name': 'Category2',
            'values': [4, 7, 1]
        }, {
            'name': 'Category3',
            'values': [3, 2, 8]
        }
    ]
}


def calculate(data: dict) -> list:
    """
    Note: Each column in data represents a monthly sales for the category.
    This function calculates total sales for each month.
    """

    return [sum(col) for col in zip(*[row for row in [val['values'] for val in data['values']]])]


if __name__ == '__main__':
    assert calculate(DATA) == [9, 14, 15]