求大神帮帮我 有偿（这学期的网课 新手真的无从下手）

import time
b=input("输入您的出生日期:")
a=time.time()
x=time.mktime(time.strptime(b,"%Y%m%d"))
c=a-x
m=c/60
h=m/60
d=h/24
y=d/365
print("你已经活了\n",int(c),"秒\n",int(m),"分钟\n",int(h),"小时\n",int(d),"天\n",round(y,2),"年")