sps = []
fl = True
while fl:
    n = int(input())
    sps.append(n)
    if (sps[0]>0 and sps[1]<0) or (sps[0]<0 and sps[1]>0):
        print("Знаки должны совпвдвть")
        sps.pop()
        continue
    if len(sps)==2:
        break
print(sps)