from collections import defaultdict
from bisect import bisect_left, bisect_right

N = int(input())

ans = []
d = {}
bs1 = []
xs = []
for i in range(N):
    A, B = map(int, input().split())
    if B == 1:
        bs1.append(i)

    xs.append((A, B))

for i, (a, b) in enumerate(xs):
    if a == 1:
        d[i+1] = i
    elif b == 2:
        j = bisect_left(bs1, i+1)
        d[bs1[j]] = i
    else:
        ans.append(i)
        t = i
        while t in d:
            ans.append(d[t])
            t = d[t]

print(*[x+1 for x in ans], sep='\n')