#==================================================
def send(i,k):
    print(i,k, flush=True)

def recieve():
    i,k=map(int,input().split())
    return i,k

def phase():
    return int(input())

def choice(turn):
    print(turn, flush=True)

#==================================================
def solve():
    from collections import defaultdict

    N=int(input())
    A=[0]+list(map(int,input().split()))

    grundy=0
    for a in A[1:]:
        grundy^=a

    turn=1 if grundy else 0
    choice(turn)

    while True:
        if turn:
            msb=1<<(grundy.bit_length()-1)
            for i in range(N+1):
                if msb&A[i]==msb:
                    break
            h=grundy^A[i]
            k=A[i]-h
            send(i,k)
        else:
            i,k=recieve()

        grundy^=A[i]^(A[i]-k)
        A[i]-=k
        if phase()==-1:
            return
        turn^=1

#==================================================
solve()