Program Primer3;
Uses Crt;
var s:String;
Function KolSimv(ch:Char;Str:String):Integer;
var i,k:Integer;
begin
k:=0;
For i:=1 to Length(Str) do
if Str[i]=ch then inc(k);
KolSimv:=k;
end;
Function StrokaUdal(ch:Char;Str:String):String;
var i:Integer;
begin
While pos(ch,Str)<>0 do
Delete(Str,pos(ch,Str),1);
StrokaUdal:=Str;
end;
begin
ClrScr;
Write('Введите строку:');
Readln(s);
If KolSimv('A',s)>KolSimv('B',s) then Writeln(StrokaUdal('B',s)) else
Writeln(StrokaUdal('A',s));
Readkey;
end.