Vanato_list

number_of_el = int(input())
list_chars = input()

vanato_list = []

for a in list_chars:
    if a == "a" or a == "b" or a == "d" or a == "e" or a == "g" or a == "o" or a == "p" or a == "q" or a == " ":
        pass
    else:
        vanato_list.append(a)

for a in vanato_list:
    print(f"{a}", end='')