import sys
from functools import reduce
from utils import Data
previous_key, first_value_json = next(sys.stdin).split(maxsplit=1)
key_group = [Data.from_json(first_value_json)]
for line in sys.stdin:
key, value_json = line.split(maxsplit=1)
value = Data.from_json(value_json)
if key == previous_key:
key_group.append(value)
else:
obj = reduce(lambda x, y: x + y, key_group)
if obj.is_viable():
print(obj.to_json())
previous_key = key
key_group = [value]
if key_group:
obj = reduce(lambda x, y: x + y, key_group)
if obj.is_viable():
print(obj.to_json())
