N = int(input())


def solve(n):
    A = []
    I = []
    count = 0
    for i in range(n - 1):
        print(f"? {i} {n-1}")
        a = int(input())
        A.append(a)
        if a > 0:
            count += 1
            I.append(i)
    if count < 2:
        print("! -1")
        return
    print(f"? {I[0]} {I[1]}")
    a = int(input())

    xl = A[I[0]] * A[I[1]] // a

    print("!", xl, end="")
    for i in reversed(range(n - 1)):
        print(A[i] // xl, end="")
    print()


solve(N)