program m1;
var
s:string;
begin
readln(s);
for i:=length(s) downto 1 do
if s[i]='б' then
begin
insert('ку',s,i);
delete(s,i+2,1);
end;
writeln(s);
end.
program m1;
var
s:string;
begin
readln(s);
for i:=length(s) downto 1 do
if s[i]='б' then
begin
insert('ку',s,i);
delete(s,i+2,1);
end;
writeln(s);
end.