N = int(input())
A = [s for s in input().split()]
B = [s for s in input().split()]

color = ['Red', 'Orange', 'Yellow', 'Green', 'Cyan', 'Blue', 'Violet']

for i in range(7):
    if len([j for j in A if j==color[i]]) != len([j for j in B if j==color[i]]):
        print(color[i])
        break