Pythonは、交換可能に大文字と小文字の任意の文字列を達成します

lis = []
lif = []
s = input().split()
for i in range(len(s)):
	p = s[i]
	lis.clear()
	for j in range(len(p)):
		if(p[j]=='#'): continue
		if(p[j]>='A' and p[j]<='Z'): lis.append(chr(ord(p[j])+32))
		elif(p[j]>='a' and p[j]<='z'): lis.append(chr(ord(p[j])-32))
		else: lis.append(p[j])
	lif.append(''.join(lis))
	
for i in range(len(lif)-1):
	print(lif[i],end=' ')
print(lif[len(lif)-1])