implicit none
integer(8) i
character(20) moji
read(*,*) moji
do i=1,len(moji)
   if (moji(i:i) >= 'a' .and. moji(i:i) <= 'z') then
       moji(i:i) = char(ichar(moji(i:i)) - 32)
   else if (moji(i:i) >= 'A' .and. moji(i:i) <= 'Z') then
       moji(i:i) = char(ichar(moji(i:i)) + 32)
   end if
end do
write(*,*) moji
end