def solve():
    rCnt = 0
    bCnt = 0
    for i in range(3):
        s = input()
        if (s == 'RED'):
            rCnt += 1
        elif (s == 'BLUE'):
            bCnt += 1
    if (rCnt > bCnt):
        print("RED")
    else:
        print("BLUE")


solve()