import sys while True: a = [float('inf'), float('inf'), float('-inf'), float('-inf')] for line in sys.stdin: b = line.split() if int(b[0]) == 0 and int(b[1]) == 0: break x, y = int(b[0]), int(b[1]) a[0] = min(a[0], x) a[1] = min(a[1], y) ...