按级别数一数

运行下面这段程序，填写它打印出来的结果。

LOG = """08:12:03 INFO auth login ok
08:12:41 ERROR db timeout
08:13:02 INFO web page 200
08:13:15 WARN auth slow login
08:14:00 INFO db query ok
08:14:22 ERROR db timeout
08:15:03 INFO auth login ok
08:15:44 INFO web page 200
08:16:10 WARN db retry
08:16:55 ERROR web page 500
08:17:20 INFO db query ok
08:18:01 INFO auth logout""".strip().splitlines()
def keep(lines, word):
    return [l for l in lines if word in l]

def field(lines, i):
    return [l.split(" ")[i] for l in lines]

def tally(items):
    d = {}
    for v in items:
        d[v] = d.get(v, 0) + 1
    return sorted(d.items(), key=lambda kv: (-kv[1], kv[0]))

rows = tally(field(LOG, 1))
print("/".join(k + "-" + str(v) for k, v in rows))