program pr1;
var i,j,n,pr:byte; ff:file of integer; mas:array[1..100] of integer;
begin
assign(ff,'date.input');
reset(ff);
i:=0;
while not eof(ff) do
begin
inc(i);
read(ff,mas[i]);
end;
n:=i;
rewrite(ff);
for i:=1 to n do
begin
pr:=0;
for j:=1 to n do
if mas[i]=mas[j] then inc(pr);
if pr=1 then write(ff,mas[i]);
end;
Close(ff);
end.