import sys
input = sys.stdin.readline

N = int(input())

products = [0]*N

# ask queries
for i in range(1, N):
    print(f"? 0 {i}", flush=True)
    x = int(input())
    if x == -1:
        exit()  # MUST exit immediately
    products[i] = x

# try all possible d0
candidates = []

for d0 in range(1, 10):
    digits = [0]*N
    digits[0] = d0

    ok = True

    for i in range(1, N):
        if products[i] % d0 != 0:
            ok = False
            break

        digits[i] = products[i] // d0

        if not (0 <= digits[i] <= 9):
            ok = False
            break

    if ok:
        candidates.append(digits)

# output
if len(candidates) == 1:
    print(f"! {''.join(map(str, candidates[0]))}", flush=True)
else:
    print("! -1", flush=True)