In [337]: a = np.asarray(input())
1 2 3 4

In [338]: a
Out[338]:
array('1 2 3 4',
      dtype='<U7')

In [341]: a = np.array(input().split()).astype(int)
1 2 3 4

In [342]: a
Out[342]: array([1, 2, 3, 4])

In [343]: a.dtype
Out[343]: dtype('int32')

In [335]: a
Out[335]: array([1, 2, 3, 4])

In [336]: a.prod()
Out[336]: 24