digits = '1234567890' * 2
ascii_lowercase = 'abcdefghijklmnopqrstuvwxyz' * 2
ascii_uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' * 2

text = input('请输入字符串：')
new_text = ''
for c in text:
    if c in digits:
        new_c = digits[digits.index(c) + 2]
    elif c in ascii_lowercase:
        new_c = ascii_lowercase[ascii_lowercase.index(c) + 2]
    elif c in ascii_uppercase:
        new_c = ascii_uppercase[ascii_uppercase.index(c) + 2]
    else:
        new_c = c
    new_text += new_c

print(f'加密后的字符串为：{new_text}')