program ISBN;
{$mode delphi}
uses
SysUtils;
var s : string;
idx, i : Integer;
sum : Integer;
v : Char;
begin
Readln(s);
idx := Pos(' ', s);
for v := '0' to '9' do begin
s[idx] := v;
sum := 0;
for i:=1 to 10 do
sum := sum + (11-i) * StrToInt(s[i]);
if sum mod 11 = 0 then begin
Writeln(v);
end;
end;
end.
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