D = int(input())

D -= 25

print('Christmas',end='')

while D<0:

    print(' Eve',end='')

    D += 1

import sys

D = int(eval(input()))

D -= 25

sys.stdout.write('Christmas')

while D<0:

    sys.stdout.write(' Eve')

    D += 1
D = int(input())
D -= 25
print("Christmas", end="")
while D < 0:
    print(" Eve", end="")
    D += 1

import sys

D = int(eval(input()))
D -= 25
sys.stdout.write("Christmas")
while D < 0:
    sys.stdout.write(" Eve")
    D += 1

-D = int(input()) +import sys + +D = int(eval(input())) -print("Christmas", end="") +sys.stdout.write("Christmas") -    print(" Eve", end="") +    sys.stdout.write(" Eve")