from collections import deque

eggs = list(map(int, input().split(", ")))
eggs_queue = deque(eggs)

paper_list = list(map(int, input().split(", ")))
box = 0
while eggs_queue and paper_list:
    current_egg = eggs_queue[0]
    paper = paper_list[-1]
    egg_paper_sum = current_egg + paper
    if current_egg <= 0:
        eggs_queue.popleft()
        continue
    if current_egg == 13:
        eggs_queue.popleft()
        paper_list[0], paper_list[-1] = paper_list[-1], paper_list[0]
        continue
    if egg_paper_sum <= 50:
        box += 1
        eggs_queue.popleft()
        paper_list.pop()
    elif egg_paper_sum > 50:
        eggs_queue.popleft()
        paper_list.pop()

if box > 0:
    print(f"Great! You filled {box} boxes.")
else:
    print("Sorry! You couldn't fill any boxes!")
if eggs_queue:
    print(f"Eggs left: {', '.join(map(str, eggs_queue))}")
if paper_list:
    print(f"Pieces of paper left: {', '.join(map(str, paper_list))}")