Расположить столбцы матрицы D[M, N] в порядке возрастания элементов k-той строки — Pascal(Паскаль)

Program Z;
uses crt;
const n=5;
var a:array[1..n,1..n]of integer;
i,j,k,l,buf:integer;
 
begin
 clrscr;
 randomize;
 writeln('Ishodnaya matriza');
 for i:=1 to n do
 begin 
  for j:=1 to n do
  begin
    a[i,j]:=random(1000);
    write(a[i,j]:4);
  end;
  writeln;
 end;
 
 writeln('Nomer stroki -> ');
 readln(k);
 
 for i:=1 to n do
 for j:=1 to n-1 do if a[k,j]>a[k,j+1] then
 for l:=1 to n do
 begin
  buf := a[l,j];
  a[l,j]:=a[l,j+1]; 
  a[l,j+1]:=buf;
 end;
 
 writeln('Preobrasovanaya matriza');
 for i:=1 to n do
 begin
  for j:=1 to n do write(a[i,j]:4);
  writeln;
 end;
 readln;
end.