open System

let No516 () =
    let rec cnt (i:int) (r:int) =
        if i < 3 then
            if String.Compare("RED", Console.ReadLine(), false) = 0 then
                cnt (i + 1) (r + 1)
            else 
                cnt (i + 1) r
        else 
            r

    if (cnt 0 0) >= 2 then
        printfn "RED"
    else 
        printfn "BLUE"
    ()

No516 ()