n = int(input())
A = []
B = []
for _ in range(n):
    a, b = map(int, input().split())
    A.append(a)
    B.append(b)

nex = [-1] * n
j = -1

tf = [True] * n

for i in range(n - 1, -1, -1):
    if B[i] == 2:
        nex[j] = i
        tf[i] = False
    elif B[i] == 1:
        j = i

    if A[i] == 1:
        nex[i + 1] = i
        tf[i] = False

for i in range(n):
    if tf[i]:
        x = i
        while x != -1:
            print(x + 1)
            x = nex[x]