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- var
- s:string;
- i:integer;
- begin
- readln(s);
- i:=1;
- while(i<=length(s)-1) do
- begin
- if(s[i]=s[i+1]) then
- begin
- delete(s,i,1);
- delete(s,i,1);
- end
- else inc(i);
- end;
- writeln(s);
- end.
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