import sys

sys.setrecursionlimit(10 ** 6)
stdin = sys.stdin

ni = lambda: int(ns())
na = lambda: list(map(int, stdin.readline().split()))
ns = lambda: stdin.readline().strip()
nsa = lambda: list(map(str, stdin.readline().split()))
ntp = lambda: tuple(map(int, stdin.readline().split()))
mod = 10 * 9 + 7
inf = 2 << 90

n = ni()
A = ns().split()
B = ns().split()

Dict = ('Red', 'Orange', 'Yellow', 'Green', 'Cyan', 'Blue', 'Violet')

for d in Dict:
    if A.count(d) != B.count(d):
        print(d)
        exit()