program CaesarCipher(output);
type
Positive = 1..MaxInt;
var
Str1: packed array [1..3] of Char;
Str2: packed array [1..12] of Char;
procedure CCStr(Str: packed array [M..N: Positive] of Char);
var
i: Integer;
begin
for i := M to N do
Write(Chr(Ord(Str[i]) - 1));
Writeln;
end;
begin
Str1 := 'IBM';
CCStr(Str1);
Str2 := 'Hello,World.';
CCStr(Str2);
end.
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