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- program z_14_27_a;
- var letter: set of 'a'..'z'; c: char;
- begin
- letter:=[];
- read(c);
- while c<>'.' do
- begin
- if (not(c in letter)) then
- begin
- write(c);
- letter:=letter+[c];
- end;
- read(c);
- end;
- end.
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