var
s:string;
i:integer;
begin
readln(s);
for i:=length(s) downto 1 do
if not (s[i] in ['0'..'9']) then
delete(s,i,1);
writeln(s);
end.
var
s:string;
i:integer;
begin
readln(s);
for i:=length(s) downto 1 do
if not (s[i] in ['0'..'9']) then
delete(s,i,1);
writeln(s);
end.