log = print


def find(s1, s2):
    r = -1
    for i in range(len(s1)):
        c = s1[i]
        if c == s2:
            r = i
            break
    return r


s = input('请输入你要加密的密码：')


def encode3(s, shift):
    lower = 'abcdefghijklmnopqrstuvwxyz'
    r = ''
    for i in range(len(s)):
        c = s[i]
        index = find(lower, c)
        if index == -1:
            r = r + c
        else:
            index = index + shift
            r = r + lower[index % len(lower)]

    print('您加密前的密码:', s)
    print('您加密后的密码:', r)


encode3(s, 4)             # 调节加密程度