S1 = input()
S2 = input()
S3 = input()

answer = {
    'RED': 0,
    'BLUE': 0
}

for S in [S1, S2, S3]:
    if S == 'RED':
        answer['RED'] += 1
    else:
        answer['BLUE'] += 1

if answer['RED'] >= answer['BLUE']:
    print('RED')
else:
    print('BLUE')