a='Christmas'

for i in range (0,25-int(eval(input()))):

  a+=' Eve'

print(a)
print(('Christmas'+(25-int(eval(input())))*' Eve'))
a = "Christmas"
for i in range(0, 25 - int(eval(input()))):
    a += " Eve"
print(a)

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

-a = "Christmas" -for i in range(0, 25 - int(eval(input()))): -    a += " Eve" -print(a) +print(("Christmas" + (25 - int(eval(input()))) * " Eve"))