Baekjoon 10814

백준 10814

import sys

n = int(sys.stdin.readline())
d= {}

class person(object):
    def __init__(self, age):
        self.age = age

    def __str__(self):
        return self.age

    def __repr__(self):
        return "'"+self.age+"'"

    def __lt__(self, other):
        return self.age < other.age

for _ in range(n):
    key, value = map(str, sys.stdin.readline().split())
    d[person(key)] = value

solution = sorted(d.items(), key=lambda x: x[0])

for k, v in solution:
    print("{} {}".format(k, v))

왜 틀림 ??????? 노 이해 모르겠음