Здравствуйте, умоляю, подскажите как делать?

Type arr25=array[1… 25] of integer; var a, b, c, d: arr25; i, a_n, b_n, c_n, d_n, sum_a, sum_b: integer; procedure show (a: arr25; length: integer); var i: integer; begin writeln; for i: =1 to length do write (a[i], '); end; procedure fill (var a: arr25; length, min, max: integer); var i: integer; begin for i: =1 to length do a[i]: =min+random (max — min+1); show (a, length); end; function average (a: arr25; length: integer): real; var i, sum: integer; begin for i: =1 to length do sum: =sum+a[i]; average: =sum / length; end; procedure sort (var a: arr25; length: integer); var key, i, j: integer; begin for i: =1 to length do begin key: =A[i]; j: =i — 1; while (j >=1) and (A[j] > key) do begin A[j+1]: =A[j]; j: =j — 1; end; A[j+1]: =key; end; end; begin fill (a, 4, 10, 50); fill (b, 10, 25, 38); fill (c, 25, 10, 38); fill (d, 15, 5, 60); writeln; writeln (average (a, 4)*average (b, 10); sort (c, 25); sort (b, 10); show (c, 25); show (b, 10); end.