Scanf.scanf "%d %d %d %d" (fun a b c d ->
    print_endline @@
        if a > c then "null" else
        if a < c then "tRue" else
        if (d - b + 3) mod 3 = 1 then "null" else
        if (d - b + 3) mod 3 = 2 then "tRue" else "Draw"
)