a = input()

print(a.lower())
print(a.upper())
list1 = a.split(" ")
aa = ""
for str1 in list1:
    b = str1[0].upper()
    c = str1[1:len(a)].lower()
    d = b+c
    aa = aa+d+" "
print(aa)

Python真的不会，用Java的思路写的，竟然通过了，只能说是个骚操作。