DIGITS = {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9,'.':'.'}

    def char2num(s):

        return DIGITS[s]

    s=list(s)

    i=s.index('.')

    s1=s[:i]

    s2=s[i+1:]

    s2.reverse()

    def fn(x, y):

        return x * 10 + y

    def fm(x, y):

        return x * 0.1 + y * 1

    return reduce(fn, map(char2num, s1))+0.1*reduce(fm, map(char2num, s2))