d = int(eval(input()))



if d == 25:

    print('Christmas')

elif d == 24:

    print('Christmas Eve')

elif d == 23:

    print('Christmas Eve Eve')

elif d == 22:

    print('Christmas Eve Eve Eve')

D = int(eval(input()))



ans = 'Christmas'

for i in range(25 - D):

    ans += ' Eve'



print(ans)
d = int(eval(input()))
if d == 25:
    print("Christmas")
elif d == 24:
    print("Christmas Eve")
elif d == 23:
    print("Christmas Eve Eve")
elif d == 22:
    print("Christmas Eve Eve Eve")

D = int(eval(input()))
ans = "Christmas"
for i in range(25 - D):
    ans += " Eve"
print(ans)

-d = int(eval(input())) -if d == 25: -    print("Christmas") -elif d == 24: -    print("Christmas Eve") -elif d == 23: -    print("Christmas Eve Eve") -elif d == 22: -    print("Christmas Eve Eve Eve") +D = int(eval(input())) +ans = "Christmas" +for i in range(25 - D): +    ans += " Eve" +print(ans)