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  1. Prepare
  2. Python
  3. Collections
  4. Collections.namedtuple()
  5. Discussions

Collections.namedtuple()

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    total = int(input())
colums = input().split()
info_ = list(input().split() for i in range(total))
print(sum(list(map(int, list(map(lambda x: x[colums.index("MARKS")], info_)))))/total)