program t45;
(* readln (s[i]) : reading into one character of a string.

   s[i] is a CHAR variable, so the read must store one byte at off+i and the
   address push has to carry the subscript.  Before this, the reader classified
   by the SYMBOL's class (TString) and pushed off, so readln(s[i]) read a whole
   line into s from its start instead.  The two reads here land at two
   different positions, so either one being wrong changes the output. *)
var
  s : string[10] ;
begin
  s := 'abcde' ;
  readln (s[2]) ;
  writeln (s) ;
  readln (s[1]) ;
  writeln (s[2], s[1])
end.