def missing_numbers(arr, brr):
    # Time complexity: O(a + b)
    # Space complexity (ignoring input): O(a + b)
    arr_dict = {}
    for value in arr:
        if value in arr_dict:
            arr_dict[value] += 1
        else:
            arr_dict[value] = 1

    brr_dict = {}
    for value in brr:
        if value in brr_dict:
            brr_dict[value] += 1
        else:
            brr_dict[value] = 1

    missing_values = []
    for key in brr_dict.keys():
        if key in arr_dict:
            if arr_dict[key] <= brr_dict[key]:
                missing_values.append(key)
        else:
            missing_values.append(key)

    missing_values.sort()
    return missing_values