Buggy python submission (verdict: Runtime Error):
mycode = r'''
# distutils: language=c++
# cython: language_level=3
# cython: boundscheck=False
# cython: wraparound=False
# cython: infer_types=True
# cython: cdivision=True

# define 
ctypedef long long LL

# 読み込みはpython側で行う
import sys
readline = sys.stdin.buffer.readline
read = sys.stdin.readline #文字列読み込む時はこっち


def ints(): return np.fromstring(readline(), sep=' ', dtype=np.int64)

cdef LL a,b
a,b=ints()
print('Odd' if (a*b)&1 else 'Even')
'''

import sys
if sys.argv[-1] == 'ONLINE_JUDGE':  # コンパイル時
    import os
    with open('mycode.pyx', 'w') as f:
        f.write(mycode)
    os.system('cythonize -i -3 -b mycode.pyx')

import mycode


Fixed submission:
mycode = r'''
# distutils: language=c++
# cython: language_level=3
# cython: boundscheck=False
# cython: wraparound=False
# cython: infer_types=True
# cython: cdivision=True
# False:Cython はCの型に対する除算・剰余演算子に関する仕様を、(被演算子間の符号が異なる場合の振る舞いが異なる)Pythonのintの仕様に合わせ、除算する数が0の場合にZeroDivisionErrorを送出します。この処理を行わせると、速度に 35% ぐらいのペナルティが生じます。 True:チェックを行いません。

# cythonライブラリよみこみ
from libcpp cimport bool
from libcpp.vector cimport vector as Vec
from libcpp.deque cimport deque as Deque
from libcpp.unordered_map cimport unordered_map as Map
from libcpp.unordered_set cimport unordered_set as Set
from libcpp.pair cimport pair as Pair
from libcpp.string cimport string as Str
from libcpp.queue cimport priority_queue as PriorityQueue
cimport libc.math as cmath

# define 
ctypedef long long LL
ctypedef long double LD
ctypedef Vec[LL] VLL #vector[long long]
ctypedef Vec[LD] VLD #vector[long double]
ctypedef LL[:] Arr
ctypedef LL[:,:] Arr2d
ctypedef LL[:,:,:] Arr3d
ctypedef LL[:,:,:,:] Arr4d #ちなみに7次元までサポートしてる


# cythonの関数定義
# TODO LL以外の型にも対応させた
cdef chmin(LL *x, LL y):
    #使用例 chmin(&dp[i + 1,jv], dp[i,j] +W[i])
    if y<x[0]:
        x[0]=y

cdef chmax(LL *x,LL y):
    #使用例 chmax(&dp[i + 1,jv], dp[i,j] +W[i])
    if x[0]<y:
        x[0]=y


cdef extern int __builtin_popcount(unsigned int) nogil #bitの数

import numpy as np
from functools import partial
array=partial(np.array, dtype=np.int64)
zeros=partial(np.zeros, dtype=np.int64)
full=partial(np.full, dtype=np.int64)

# 読み込みはpython側で行う
import sys
readline = sys.stdin.buffer.readline
read = sys.stdin.readline #文字列読み込む時はこっち

def exit(*argv,**kwarg):
    print(*argv,**kwarg)
    sys.exit()


cdef LL a_int(): return int(readline())

def ints(): return np.fromstring(readline(), sep=' ', dtype=np.int64)
def doubles(): return np.fromstring(readline(), sep=' ', dtype=np.longdouble)

def py_ints() : list(map(int, readline().split()))

def read_matrix(LL H,LL W):
    #return np.ndarray shape=(H,W) matrix
    lines=[]
    cdef LL _
    for _ in range(H): 
        lines.append(read())
    lines=' '.join(lines) #byte同士の結合ができないのでreadlineでなくreadで
    return np.fromstring(lines, sep=' ',dtype=np.int64).reshape(H,W)


cdef LL MOD = 10**9 + 7
cdef LL INF= 9_223_372_036_854_775_807 #LLのmax

# python import
from collections import defaultdict, Counter, deque
from operator import itemgetter, xor, add
from bisect import bisect_left, bisect_right #, insort_left, insort_right
from functools import reduce
from math import gcd

cdef LL a,b
a,b=ints()
print('Odd' if (a*b)&1 else 'Even')
'''

import sys
if sys.argv[-1] == 'ONLINE_JUDGE':  # コンパイル時
    import os
    with open('mycode.pyx', 'w') as f:
        f.write(mycode)
    os.system('cythonize -i -3 -b mycode.pyx')

import mycode