import sys def printPos(x, y): print str(x) + " " + str(y) sys.stdout.flush() def go(): SZ = int(raw_input()) printPos(0,0) while True: line = str(raw_input()) nums = [int(s) for s in line.split() if s.isdigit()] ax, ay = nums[0], nums[1] printPos(-ax, -ay) if __name__ == "__main__": go()