program Project2;

{$APPTYPE CONSOLE}
var s,s1:string;
    i:integer;
begin
assign(Input,'text.in');
reset(Input);
  readln(s);
Close(Input);

  s1:='';
  for i:=1 to length(s) do
        if s[i] in ['A'..'Z'] then s1:=s1+chr(ord(s[i])+32) else
          if s[i] in ['a'..'z'] then s1:=s1+chr(ord(s[i])-32) else
            s1:=s1+s[i];

assign(Output,'text.out');
rewrite(Output);
  writeln(s1);
close(Output);
end.