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  1. var k: integer;
  2. var s: string;
  3. begin
  4. readln(s);
  5. repeat
  6. k:=pos('and',s);
  7. if k>0
  8. then begin
  9. delete(s,k,3);
  10. insert('or',s,k);
  11. end;
  12. until k=0;
  13. writeln(s);
  14. end.
Success #stdin #stdout 0.01s 4068KB
stdin
Romeo and Juliette
stdout
Romeo or Juliette