N = int(input())
S = input()

if 'H' in S or '9' in S or '+' in S:
    print(-1)
    exit()
    
Q = S.count('Q')

if Q==0:
    print(-1)
    exit()
    
x = -1

for i in range(Q+1):
    if i*i==Q:
        x = i

if x==-1:
    print(-1)
    exit()

print(S[:N//x])