VAR
 f_in, f_out: File of Integer;
 i,N,Nn,vl:integer;

BEGIN
 N:=40;
 Randomize;
 Assign(f_in,'D:\Inp.dat');
 Rewrite(f_in);
 Nn:=0;
 for i:=1 to N do
  begin
   vl:=50-Random(100);
   Write(f_in, vl);
  end;
 Close(f_in);
 Reset(f_in);
 Assign(f_out,'D:\Out.dat');
 Rewrite(f_out);
 for i:=1 to N do
  begin
   Read(f_in,vl);
   If vl<0 then
    begin
     Inc(Nn);
     Write(f_out,vl);
    end;
  end;
 Close(f_out);
 Writeln('Input file contents: ');
 Reset(f_in);
 For i:=1 to N do
  begin
   Read(f_in,vl);
   Write(vl:4);
  end;
 Close(f_in);
 Writeln;
 Writeln('Number of negative elements is ',Nn);
 Writeln;
 Writeln('Output file contents: ');
 Reset(f_out);
 For i:=1 to Nn do
  begin
   Read(f_out,vl);
   Write(vl:4);
  end;
 Close(f_out);
 Readln
END.