import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

n = ni()
a, b = zip(*[na() for i in range(n)])
nxt = [-1] * n
last = -1
s = []
for i in range(n-1, -1, -1):
    if a[i] == 1:
        nxt[i+1] = i
    elif b[i] == 2:
        nxt[last] = i
    else:
        s.append(i)
    if b[i] == 1:
        last = i

ans = []
for x in s[::-1]:
    y = x
    ans.append(y)
    while nxt[y] != -1:
        y = nxt[y]
        ans.append(y)

for i in ans:
    print(i + 1)