program t47;
(* readln (s[i]) with a VARIABLE index.

   The address of the one byte the reader must store into is off+i, and i is
   only known at run time, so the reader has to carry a computed address:
   ParseSub leaves it in DI and IoCall pushes DI instead of a constant
   off+boff.  t45 covers the same path with a constant index, which folds into
   boff; the two differ in exactly where the address comes from. *)
var
  g : string[8] ;
  i : integer ;
begin
  g := '........' ;
  i := 3 ;
  readln (g[i]) ;
  writeln (g) ;
  i := 6 ;
  readln (g[i]) ;
  writeln (g) ;
  writeln (g[3], g[6])
end.