n=int(input())
e=[[] for i in range(n)]
es=[]
for i in range(n-1):
  u,v=map(int,input().split())
  u-=1
  v-=1
  e[u]+=[v]
  e[v]+=[u]
  es+=[(u,v)]
v=[0]*n
u=[0]*n
q=[0]
v[0]=1
for s in q:
  for t in e[s]:
    if v[t]==0:
      v[t]=1
      u[t]=u[s]^1
      q+=[t]
q=[a+1 if u[a] else b+1 for a,b in es]
print("?",*q)
a=input()
if a=="Yes":
  p=[i for i in range(n) if u[i]==1]
else:
  p=[i for i in range(n) if u[i]==0]
while len(p)>1:
  pl=p[:len(p)//2]
  pr=p[len(p)//2:]
  u=[0]*n
  for i in pl:
    u[i]=1
  for i in pr:
    u[i]=-1
  q=[a+1 if u[a]!=0 else b+1 for a,b in es]
  print("?",*q)
  a=input()
  if a=="Yes":
    p=pl
  else:
    p=pr
a=p[0]+1
print("!",a)