program znanija;

var

i,a,b: integer;

begin

a:=-10;

for i:=1 to 21 do

begin

b := abs(a);

writeln(a, ' ', b);

a:=a+1;

end;

end.

Program n_1;

var i:integer;

begin

   for i:=-10 to 10 do writeln(i:3, ' ', abs(i):3);

end.