Collecting Eggs

from collections import deque

eggs = deque([int(x) for x in input().split(', ')])
papers = [int(x) for x in input().split(', ')]

boxes = 0
while eggs and papers:
    egg = eggs.popleft()
    if egg < 0:
        continue

    if egg == 13:
        first_paper = papers[0]
        last_paper = papers[-1]
        papers.append(first_paper)
        papers.insert(0, last_paper)
        continue

    paper = papers.pop()

    total_sum = egg + paper

    if total_sum <= 50:
        boxes += 1

    else:
        continue

if boxes >= 1:
    print(f"Great! You filled {boxes} boxes.")
else:
    print(f"Sorry! You couldn't fill any boxes!")

if eggs:
    print(f"Eggs left: {', '.join([str(x) for x in eggs])}")

if papers:
    print(f"Pieces of paper left: {', '.join([str(x) for x in papers])}")