n=int(input())
s=input()
if s.count("Q")==1 and s.count("H")==0 and s.count("9")==0:
    print(s)
elif s.count("Q")!=0:
    for i in range(2,n+1):
        if n%i==0:
            for j in range(n//i):
                if s[(n//i)*j:(n//i)*(j+1)]!=s[(n//i)*(j+1):(n//i)*(j+2)]:
                    break
            else:
                print(s[:(n//i)])
                break
    else:
        print(-1)
else:
    print(-1)