program Project2;

{$APPTYPE CONSOLE}

uses
  SysUtils;

var
f:text;
a:ansistring;
i,b:integer;
begin
  assign(f, 'text.in');
  reset(f);
  read(f, a);
  close(f);
  b:=length(a);
  for i:=1 to b do  begin
    if (ord(a[i])>=97 and ord(a[i])<=122) then a[i]:=chr(ord(a[i])-32) else
    if (ord(a[i])<=90 and a[i]>=65) then a[i]:=chr(a[i]+32);
  end;
  assign(f, 'text.out');
  rewrite(f);
  writeln(f, a);
  close(f);
end.