ПОНИМАЮ ГЕОМЕТРИЮ

def func (s):
    l = [x for x in s]
    one = [x for x in l if l.count(x) % 2 == 1]
    if len(one) > 1:
        return False
    one = one[0]
    s2 = ""
    while l:
        k = l[0]
        s2 += k*(l.count(k)//2)
        l = [x for x in l if x != k]
    return s2+one+s2[::-1]