import operator


def difference(vec1, vec2):
    """Return difference between given vectors.
    
    >>> v1 = [1, 2, 3, 4]
    >>> v2 = [5, 6, 7, 8]
    >>> v3 = [0, 0, 0, 0]

    >>> difference(v2, v1)
    [4, 4, 4, 4]
    >>> difference(v2, v3)
    [5, 6, 7, 8]
    """
    return map(operator.sub, vec1, vec2)