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