Baekjoon 7785

문제 확인하기

n = int(input())
s = dict()
for i in range(n):
    a, b = map(str, input().split())
    if b == "enter":
        s[a] = 1
    else:
        del s[a]
s = sorted(s.keys(), reverse=True)
for k in s:
    print(k)