uses
SysUtils;
var i,n:integer;
s,k,l:string;
begin
Write('BBEguTe TeKcT.');
Writeln;
Write('TeKcT=');
Readln(s);
Write('BBeguTe cJloBo k.');
Writeln;
Write('k=');
Readln(k);
Write('BBeguTe cJloBo l.');
Writeln;
Write('l=');
Readln(l);
For i:=1 to Length(s) do
If pos(k,s)<>0 then
begin
n:=pos(k,s);
Delete(s, n, Length(k));
Insert(l, s, n);
end
else
Break;
Write('HoBbIU TeKcT:');
Writeln;
Write(s);
Readln;
end.