const
n=20;
var
i:integer;
a:array[1..n] of integer;
begin
for i:=1 to n do
begin
a[i]:=random(20);
write(' ',a[i]:3);
end;
writeln('------');
i := 1;
while ((i+10)<=20) do begin
Write(a[i], ' ', a[i+10],' ');
i := i + 2;
end;
WriteLn;
end.