import sys


def ask(a, b):
    print(f"? {a} {b}", flush=True)
    x = int(sys.stdin.readline())
    if x == -1:
        sys.exit()
    return x


def done(ans):
    if ans is None:
        print("! -1", flush=True)
    else:
        print("! " + ''.join(map(str, ans[::-1])), flush=True)
    sys.exit()


def main():
    n = int(sys.stdin.readline())

    ways = [[] for _ in range(82)]
    for a in range(1, 10):
        for b in range(1, 10):
            ways[a * b].append((a, b))

    top_mul = [0] * (n - 1)
    pos = []

    for i in range(n - 1):
        top_mul[i] = ask(i, n - 1)
        if top_mul[i] > 0:
            pos.append(i)

    if len(pos) >= 2:
        a, b = pos[0], pos[1]
        mid = ask(a, b)

        top = -1
        for d in range(1, 10):
            if d * d * mid != top_mul[a] * top_mul[b]:
                continue

            ok = True
            for x in top_mul:
                if x % d:
                    ok = False
                    break
                if x // d > 9:
                    ok = False
                    break
            if ok:
                top = d
                break

        if top == -1:
            done(None)

        ans = [0] * n
        ans[-1] = top
        for i in range(n - 1):
            ans[i] = top_mul[i] // top
        done(ans)

    if len(pos) == 1:
        i = pos[0]
        p = top_mul[i]
        if len(ways[p]) == 1:
            a, b = ways[p][0]
            ans = [0] * n
            ans[-1] = a
            ans[i] = b
            done(ans)

    done(None)


if __name__ == "__main__":
    main()