def main():
  N=int(input())
  A=list(map(int,input().split()))
  def f():
    t=0
    for i in A:
      t^=i
    c=0
    m=-1
    d=0
    while t>0:
      if (t&1):
        m=c
        d+=(1<<c)
      c+=1
      t>>=1
    for i in range(len(A)):
      if (A[i]>>m)&1 and A[i]>=d:
        A[i]-=d
        return [i+1,d]
  s=0
  for i in A:
    s^=i
  if s!=0:
    print(1,flush=True)
    print(*f(),flush=True)
    r=int(input())
    if r==-1:
      return
  else:
    print(0,flush=True)
  while 1:
    a,b=map(int,input().split())
    A[a-1]-=b
    r=int(input())
    if r==-1:
      return
    print(*f(),flush=True)
    r=int(input())
    if r==-1:
      return
  return

main()