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Right Insertion Point

Write a function `right_insertion(a, x)` that determines the index at which a specified value `x` should be inserted into a sorted list `a` to maintain the sorted order. If `x` is already present in the list, the function should return the index after the last occurrence of `x`.

#### Example Usage
```python [main.nopy]
right_insertion([1, 2, 4, 5], 6)  # Output: 4
right_insertion([1, 2, 4, 5], 3)  # Output: 2
right_insertion([1, 2, 4, 5], 7)  # Output: 4
```

#### Constraints
- The input list `a` is guaranteed to be sorted in ascending order.
- The function should have a time complexity of O(log n).
- You may use Python's built-in libraries to assist in solving the problem.
import bisect

def right_insertion(a, x):
    """
    Determine the right insertion point for x in the sorted list a.

    Args:
        a (list): A sorted list of elements.
        x (any): The value to find the insertion point for.

    Returns:
        int: The index where x should be inserted to maintain sorted order.
    """
    # Use the bisect module to find the right insertion point
    pass
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