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program Change;

var

 n, i, j, t: Integer;

 A: array of Integer;

begin

 Write ('Введите четное число N: ');

 ReadLn (n);

 if n mod 2 = 0 then begin

   SetLength (A, n);

   Randomize;

   for i := Low (A) to High (A) do begin

     A [i] := Random (100);

     Write (A [i] :3, ' ');

   end;

   i := 0;

   while i < n do begin

     t := A [i];

     A [i] := A [i + 1];

     A [i + 1] := t;

     i := i + 2;

   end;

   WriteLn;

   for i := Low (A) to High (A) do begin

     Write (A [i] :3, ' ');

   end;

 end else

   WriteLn ('Введено не четное число.');

 ReadLn;

end.

1.
var
  s: string;
  i, count: integer;
begin
  writeln('Vvedite stroky: ');
  readln(s);
  for i := 1 to length(s) - 2 do
    if copy(s, i, 3) = 'abc' then
      count := count + 1;
  writeln('Kol-vo: ', count);
end.
2.
var
  s1, s2: string;
  i, len1, len2: integer;
begin
  writeln('Vvedite stroky 1: ');
  readln(s1);
  writeln('Vvedite stroky 2: ');
  readln(s2);
  len1 := length(s1);
  len2 := length(s2);
  if len1 > len2 then writeln('1 stroka dlinnee')
  else if len1 < len2 then writeln('2 stroka dlinnee')
  else writeln('dlini strok ravnie')
end.
3.
var
  s1, s2, s3: string;
begin
  writeln('Vvedite stroky 1: ');
  readln(s1);
  writeln('Vvedite stroky 2: ');
  readln(s2);
  s3 := s1[1] + s1[2] + s2[1] + s2[2];
  writeln('Novaja stroka: ', s3);
end.