import math
n = int(input())
a = [0 for _ in range(n)]
c0 = 0
for i in range(n-1):
	print('? '+str(i)+' '+str(n-1),flush = True)
	x = int(input())
	a[i] = x
	if x == 0:
		c0 += 1
if n-1-c0 == 0:
	print('! -1',flush = True)
	exit()
if n-1-c0 == 1:
	for i in range(n-1):
		if a[i] != 0:
			break
	if not (a[i] in (1,25,36,49,64,81)):
		print('! -1',flush = True)
		exit()
	a[n-1] = math.isqrt(a[i])
	a[i] = math.isqrt(a[i])
	ans = ''.join(map(str,a[::-1]))
	print('! '+ans,flush = True)
	exit()
t = []
for i in range(n-1):
	if a[i] != 0:
		t.append(i)
		if len(t) == 2:
			break
print('? '+str(t[0])+' '+str(t[1]),flush = True)
x = int(input())
a[n-1] = math.isqrt(a[t[0]]*a[t[1]]//x)
for i in range(n-1):
	a[i] //= a[n-1]
ans = ''.join(map(str,a[::-1]))
print('! '+ans,flush = True)