669 B | 669 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from datetime import datetime, timedelta
sys.setrecursionlimit(10**7)
BLANK = " "
#inp = input
inp = lambda : sys.stdin.readline().rstrip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
n = ii()
l = [inp() for _ in range(n)]
for i in range(2 * n):
p("?", l[i // 2], flush=True)
ret = inp()
if ret == "1":
p("!", l[i // 2], flush=True)
break
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()