# -*- coding: utf-8 -*-

from functools import reduce

def str2float(s):

    s1 = s.split(".")[0].strip()

    s2 = s.split(".")[1].strip()

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

    def fn(x, y):

        return x * 10 + y

    def char2num(s):

        return DIGITS[s]

    return reduce(fn,map(char2num, s1)) + reduce(fn,map(char2num,s2))/10**len(s2)