import random
import datetime

ALP = [
'A', 'B', 'C', 'D', 'E', 'F', 'G',
'H', 'I', 'J', 'K', 'L', 'M', 'N',
'O', 'P', 'Q', 'R', 'S', 'T', 'U',
'V', 'W', 'X', 'Y', 'Z'
]
r = random.choice(ALP)
alp = ''

for i in ALP:
    if i != r:
        alp = alp + i
        
print(alp)
st = datetime.datetime.now()
ans = input('缺少哪個字母呢?')

if ans == r:
    print('答案正確')
    et = datetime.datetime.now()
    print('總共花了 ' + str((et - st).seconds) + ' 秒喲')
else:
    print('答案錯誤')