n = int(input())
if n % 2 == 1:
    print(1, n // 2 + 1)
else:
    print(2, n // 2)
while 1:
    t = int(input())
    if t == 0 or 1:
        break
    k, x = map(int, input().split())
    
    print(k, n - x + 2 - k)