N = int(input())
flag = True
A = [0]*N
for i in range(N-2,-1,-1):
    print(f"? {i} {N-1}")
    p = int(input())
    if p<=0:
        flag = False
        break
    A[i] = p
if not flag or N==2:
    print("! -1")
else:
    print(f"? {N-3} {N-2}")
    A[N-1] = int(input())
    ans = [0]*N
    x = A[N-2]*A[N-3]//A[N-1]
    for i in range(1,10):
        if i*i==x:
            ans[N-1] = i
            break
    for i in range(N-2,-1,-1):
        ans[i] = A[i]//ans[N-1]
    ans = ans[::-1]
    print(f"! {''.join(str(x) for x in ans)}")