n = int(input())
a = [0] * n
b = [0] * n
for i in range(n):
    ai, bi = map(int, input().split())
    a[i] = ai
    b[i] = bi
ans = []
jump = [-1] * n
for i in range(n):
    if a[i] == 1:
        jump[i+1] = i
    elif b[i] == 2:
        j = i
        while b[j] != 1:
            j += 1
        jump[j] = i
    else:
        ans.append(i + 1)
        while jump[i] != -1:
            i = jump[i]
            ans.append(i + 1)
print(*ans, sep='\n')