var
i:integer;
begin
for i:=1001 to 9999 do
if (i div 1000=i mod 10) and (i div 100 mod 10=i div 10 mod 10)
then write(i,',');
end.
var
i:integer;
begin
for i:=1001 to 9999 do
if (i div 1000=i mod 10) and (i div 100 mod 10=i div 10 mod 10)
then write(i,',');
end.