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program Ch1;
{$mode objfpc}
uses
SysUtils,Types;
var
Input:Integer;
function FourIsMagic(N:Integer):AnsiString;
var
Words:TStringDynArray = ('one','two','three','four','five',
'six','seven','eight','nine');
Len:Integer;
begin
Result := '';
Len := Length(Words[N-1]);
repeat
Result := Result + Words[N-1] + ' is ' + Words[Len-1] + ', ';
N := Len;
Len := Length(Words[N-1]);
until(N = 4);
Result := Result + 'four is magic.';
Result[1] := UpCase(Result[1]);
end;
begin
if ParamCount < 1 then
begin
WriteLn(StdErr, 'No args provided!');
Halt(1);
end;
if StrToInt(ParamStr(1)) > 9 then
begin
WriteLn(StdErr, 'Number must be less than 10!');
Halt(1);
end;
try
Input := StrToInt(ParamStr(1));
except on E:EConvertError do
Halt(1);
end;
WriteLn(FourIsMagic(Input));
end.
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