while True: try: n = int(input()) num_list = list(map(int, input().split())) a, b = [], [] for i in num_list: if i > 0: a.append(i) elif i < 0: b.append(i) if a or b: print(len(b), round(sum(a) / len(a), 1)) else : print("0 0.0") except: break 修补一下能用，不过还有bug