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

one_stack = []
two_stack = []

ans = []
for i in range(N):
    if A[i] == 1:
        one_stack.append(i)
    elif B[i] == 2:
        two_stack.append(i)
    elif B[i] == 1:
        ans.append(i)
        ans.append(j := two_stack.pop())
        while (one_stack and one_stack[-1] == j-1) or B[j] == 1:
            if one_stack and one_stack[-1] == j-1:
                ans.append(j := one_stack.pop())
            else:
                ans.append(j := two_stack.pop())
    else:
        ans.append(j := i)
        while (one_stack and one_stack[-1] == j-1) or B[j] == 1:
            if one_stack and one_stack[-1] == j-1:
                ans.append(j := one_stack.pop())
            else:
                ans.append(j := two_stack.pop())

for i in range(N):
    print(ans[i]+1)