only_numeric

def only_numeric(a):
    n = []
    for i in a:
        if type(i) == list:
            for j in i:
                if type(j) == int or type(j) == float:
                    n.append(j)
        else:
            if type(i) == int or type(i) == float:
                n.append(i)
    return n