n=int(input())
stks=[]
ba = 0
for i in range(n):
  a,b = map(int, input().split())
  if b == 2 or a == 1:
    if ba == 1 or b == 1:
      stks[-1].append(i)
    else:
      stks.append([i])
  elif b == 1 or ba == 1:
    print(i+1)
    while len(stks[-1]) > 0:
      print(stks[-1].pop()+1)
    stks.pop()
  else:
    print(i+1)
  ba = a  
  assert(len(stks) <= 2)