[python] 백준 1764 번 : 듣보잡 (실버 4)

https://www.acmicpc.net/problem/1764

딕셔너리를 사전순으로 정렬하는 것만 잊지 않으면 된다.

import sys
input = sys.stdin.readline
n , m = map(int,input().split())

people = dict()
peoplelist = list()
for _ in range(n+m):
    temp = input().rstrip()
    if temp in people:
        people[temp] += 1
    else:
        people[temp] = 1
count = 0

for i in sorted(people):
    if people[i] >= 2:
        count += 1
        peoplelist.append(i)

print(count)
for i in peoplelist:
    print(i)