import std.experimental.all;

void main()

{

    "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b".byCodeUnit.chunks(2).retro.joiner.writeln;

    "4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b".byCodeUnit.slide(2, 2).retro.joiner.writeln;

}