I submitted a program 1008. Two times I got compilations
errors. The code that was 'bad' (Pascal):

Var
  S:String;

.....
Begin
.......
  Dec(S[0]); { Decrements length of the string S }
......
End.

Delphi don't like this, you see...
After changing 'Dec(S[0])' to 'Delete(S,length(S),1)' the
program was accepted!