const
n=10;
var
i,t: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();
writeln('-------');
for i:=3 to 5 do
begin
t:=a[i];
a[i]:=a[12-i];
a[12-i]:=t;
end;
writeln('-------');
for i:=1 to n do
write(' ',a[i]:3);
writeln();
end.