题解 | #格式化输出（二）#

from os.path import sep
name=input()
name1=name.lower()
name2=name.upper()
name3=""
print(name1,name2,sep='\n')
char1=''
for i, char in enumerate(name):
    if(i==0 or char1==' '):
        if(ord('a')<ord(char)<ord('z')):
            char=chr(ord(char)+ord('Z')-ord('z'))
    else:
        if(ord('A')<ord(char)<ord('Z')):
            char=chr(ord(char)-ord('Z')+ord('z'))
    name3+=char
    char1=char
print(name3)

ord+chr