import os

def f():
    names = [i for i in os.listdir('.') if '1.4' in i]
    res = []
    for name in names:
        n, e = name.split('-beta')
        a, b = n.split('1.4')
        res.append(a + '1.4' + 'beta' + b + e)
    for old, new in zip(names, res):
        os.system('mv ' + old + ' ' + new)

f()