"""

result[course][max/min/sum/count]

result["语文"]["max"] = 99

result["语文"]["min"] = 75

result["语文"]["sum"] = 800

result["语文"]["count"] = 10

result["数学"]["max"] = 10

result["数学"]["min"] = 10

result["数学"]["sum"] = 10

result["数学"]["count"] = 10

"""

result = {}

with open("input.txt") as fin:

for line in fin:

line = line.strip()

fields = line.split("\t")

name, course, grade = fields

if course not in result:

result[course] = {}

result[course]["max"] = 0

result[course]["min"] = 999

result[course]["sum"] = 0

result[course]["count"] = 0

grade = int(grade)

if grade > result[course]["max"]:

result[course]["max"] = grade

elif grade < result[course]["min"]:

result[course]["min"] = grade

result[course]["sum"] += grade

result[course]["count"] += 1

for key, value in result.items():

print(key, value)

out_fields = [

key,

value["max"],

value["min"],

value["sum"]/value["count"]

]

print(out_fields)