package main

import "fmt"

func main() {
	var b, r int
	var s, ans string
	for i := 0; i < 3; i++ {
		fmt.Scan(&s)
		if s == "BLUE" {
			b++
		} else {
			r++
		}
	}
	if b >= 2 {
		ans = "BLUE"
	} else {
		ans = "RED"
	}
	fmt.Println(ans)
}