import java.io.*;

// 処理
class Process {
    private String[] S;

    Process(String[] S) {
        this.S = S;
    }

    String getResult() {

        int redCount = 0;
        for(var s : S) {
            if(s.equals("RED")) {
                redCount++;
            }
        }
        return ((redCount > 1) ? "RED" : "BLUE");
    }
}

public class Main {
    public static void main(String[] args) throws IOException {
        var bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        var printWriter    = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));

        // 入力
        var S = new String[3];
        for(int i = 0; i < S.length; i++) {
            S[i] = bufferedReader.readLine().trim();
        }

        // 出力
        printWriter.println((new Process(S)).getResult());

        bufferedReader.close();
        printWriter.close();
    }
}