program task_a;

{$APPTYPE CONSOLE}

uses
  SysUtils;

var
i:integer;
  t,ans:ansistring;
  f:text;
begin
assign(f,'text.in');
reset(f);
readln(f,t);
close(f);

assign(f,'text.out');
rewrite(f);
ans:='';
for i:=1 to length(t) do
begin
if (t[i] in ['a'..'z']) then begin ans:=ans+char(ord(t[i])-32); continue;  end;
if (t[i] in ['A'..'Z']) then begin  ans:=ans+char(ord(t[i])+32); continue;  end;
ans:=ans+t[i];
end;
writeln(f,ans);

close(f);
end.