N=int(input())
stack1=[]
stack2=[]
for i in range(1,N+1):
    A,B=map(int,input().split())
    if A==0:
        if B==0:
            print(i)
            while len(stack1) and len(stack2) and stack1[-1]>stack2[-1]:
                print(stack1.pop())
        elif B==1:
            print(i)
            print(stack2.pop())
        else:
            stack2.append(i)
    else:stack1.append(i)
stack=sorted(stack1+stack2,reverse=True)
for i in stack:
    print(i)