d=25-int(eval(input()));print(("Christmas"+" Eve"*d))
print(("Christmas"+" Eve"*(25-int(eval(input())))))
d = 25 - int(eval(input()))
print(("Christmas" + " Eve" * d))

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

-d = 25 - int(eval(input())) -print(("Christmas" + " Eve" * d)) +print(("Christmas" + " Eve" * (25 - int(eval(input())))))