X = 0
left, right = -1, 100001
while right - left > 1:
    mid = (left + right) // 2
    print(X, mid, flush=True)
    D1 = int(input())
    if D1 == 0:
        exit()
    print(X, mid + 1, flush=True)
    D2 = int(input())
    if D2 == 0:
        exit()
    if D1 > D2:
        left = mid
    else:
        right = mid
print(0, right, flush=True)
D = int(input())
if D == 0:
    exit()
print(D, right, flush=True)