//PascalABC.NET
begin
for var i := 10 to 99 do
for var j := 10 to 99 do
if (i div 10 = j mod 10) and (i mod 10 = j div 10) then
writeln(i, ' ', j);
end.
//PascalABC.NET
begin
for var i := 10 to 99 do
for var j := 10 to 99 do
if (i div 10 = j mod 10) and (i mod 10 = j div 10) then
writeln(i, ' ', j);
end.