d = int(eval(input()))

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

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

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