print(('Christmas'+' Eve'*(25-int(eval(input())))))
print((-int(eval(input('Christmas')))%5*' Eve'))
print(("Christmas" + " Eve" * (25 - int(eval(input())))))

print((-int(eval(input("Christmas"))) % 5 * " Eve"))

-print(("Christmas" + " Eve" * (25 - int(eval(input()))))) +print((-int(eval(input("Christmas"))) % 5 * " Eve"))