n = int(input())
right = set()
tmp_set = set(input().split())
tmp_str = input()
while tmp_str != "HELP":
    if tmp_str == "YES":
        right = tmp_set - right
    elif tmp_str == "NO":
        right = right - tmp_set
    else:
        tmp_set = set(tmp_str.split())
    tmp_str = input()
right = set(map(int, right))
print(*sorted(list(right)))