n = int(input())
S = input()


if 'Hello, World!' in S:
    S = S.replace('Hello, World!', 'H')
    if set(S) == {'H'}:
        print(S)
    else:
        print(-1)
elif 'H' not in S and '9' not in S and 'Q' in S:
    print(S)
else:
    print(-1)