s=list(input())
ans=[]
c=[chr(i) for i in range(97, 97+26)]
C=[chr(i) for i in range(65, 65+26)]
for i in range(len(s)):
  for j in range(26):
    if s[i]==c[j]:
      ans.append(C[j])
    if s[i]==C[j]:
      ans.append(c[j])
print(''.join(ans))