#!/usr/local/bin/python3

from sys import argv
from collections import defaultdict

with open(argv[1], 'r') as file1:
    ids_1 = defaultdict(list)
    for line in file1:
        line = line.strip()
        id_ = line.partition('_')[0]
        ids_1[id_].append(line)

with open(argv[2], 'r') as file2:
    ids_2 = defaultdict(list)
    for line in file2:
        line = line.strip()
        id_ = line.partition('_')[0]
        ids_2[id_].append(line)

comkeys = set(ids_1.keys()) & set(ids_2.keys())

for key in comkeys:
    print(*ids_1[key], sep=" ", end=" ")
    print(*ids_2[key], sep=" ", end="\n")