N = int(input())
A = [0]*N
B = []
for i in range(N-2,-1,-1):
    print(f"? {i} {N-1}")
    A[i] = int(input())
    if A[i]>0:
        B.append(i)
if len(B)==0:
    print("! -1")
elif len(B)==1:
    x = A[B[0]]
    B = []
    for i in range(1,10):
        if x%i==0 and x//i<=9:
            B.append((i,x//i))
    if len(B)==1:
        ans = [0]*N
        ans[N-1] = B[0][0]
        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)}")
    else:
        print("! -1")
else:
    B = sorted(B)
    print(f"? {B[0]} {B[1]}")
    A[N-1] = int(input())
    ans = [0]*N
    x = A[B[0]]*A[B[1]]//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)}")