months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September',
'October', 'November', 'December']
#一个列表，其中包含数1~31对应的结尾
endings = ['st', 'nd', 'rd'] + 17 * ['th'] + ['st', 'nd', 'rd'] + 7 * ['th'] + ['st']
year = input("Year:")
month = input("Month(1-12):")
day = input("Day(1-31):")
month_number = int(month)
day_number = int(day)
# 别忘了将表示月和日的数减1，这样才能得到正确的索引
month_name = months[month_number - 1]
ordinal = day + endings[day_number - 1]
print(month_name + ' ' + ordinal + ',' + year)
