关于#python#的问题，请各位专家解答！

ls=list(input().split())
pw=''
for c in ls[1]:
if c.islower():
if ord(c)+int(ls[0]) <=122:
pw=pw+(chr(ord(c)+int(ls[0])))
else:
pw=pw+(chr(ord(c)+int(ls[0])-26))
elif c.isupper():
if ord(c)+int(ls[0]) <=90:
pw=pw+(chr(ord(c)+int(ls[0])))
else:
pw=pw+(chr(ord(c)+int(ls[0])-26))
else:
pw=pw+c
print(pw)

注意缩进哟！