program z1;

{$APPTYPE CONSOLE}

var f1,f2:text;
    a,b,n,i,j:integer;
    ch:char;

begin
assign(f1,'text.in');
assign(f2,'text.out');
reset(f1);
rewrite(f2);
while not eof(f1) do
begin
read(f1,ch);
if (ord(ch)>64) and (ord(ch)<91) then write(f2,chr(ord(ch)+32)) else
if (ord(ch)>96) and (ord(ch)<123) then write(f2,chr(ord(ch)-32)) else write(f2,ch); 
end;
writeln(f2);
close(f1);
close(f2);
end.