from collections import deque


def boarding_passengers(capacity, *args):
    guests = {}
    boarding_queue = deque(args)
    total_passengers = sum(int(group[0]) for group in args)
    while capacity > 0 and boarding_queue:
        passengers, benefit_plan = boarding_queue.popleft()
        passengers = int(passengers)
        if passengers <= capacity:
            if benefit_plan not in guests:
                guests[benefit_plan] = 0
            guests[benefit_plan] += passengers
            capacity -= passengers
    result = ["Boarding details by benefit plan:"]
    for group, guests_num in sorted(guests.items(), key=lambda item: (-item[1], item[0])):
        result.append(f"## {group}: {guests_num} guests")

    if sum(guests.values()) == total_passengers:
        result.append("All passengers are successfully boarded!")

    elif capacity == 0:
        result.append("Boarding unsuccessful. Cruise ship at full capacity.")
    else:
        result.append(f"Partial boarding completed. Available capacity: {capacity}.")

    return "\n".join(result)