program ariiskii_vlastelin;
uses crt;
var
a: string;
i: integer;
begin
clrscr;
writeln('строку');
readln(a);
For i := 1 to length(a) do
begin
If copy(a, i, 1) = 'а' then
begin
delete(a, i, 1);
insert('ку', a, i);
end;
end;
writeln(a);
readln;
end.