program Project1;
var
i, P1 : Integer;
S : String;
begin
Writeln('Задайте строку:');
Readln(S);
P1 := 0;
for i := Length(S) downto 1 do begin
if S[i] = ')' then P1 := i;
if (P1 > 0) and (S[i] = '(') then begin
Delete(S, i, P1 - i + 1);
P1 := 0;
end;
end;
Writeln('Результат:');
Writeln(S);
Readln;
end.