program z1; var a:array [1..20] of integer; b,i:integer; begin b:=0; for i:= 1 to 20 do a[i]:=random(30)-15; for i:= 1 to 20 do write(a[i]); writeln; b:=a[6]; a[6]:=a[16]; a[16]:=b; write(a[i]); end.