陳珺

a=int(input("成績="))
if a<=100 and a>=90:
    print("you")
   
elif a<=89 and a>=80:
    print("jia")

elif a<=79 and a>=70:
    print("乙等")
   
elif a<=69 and a>=60:
    print("丙等")
   
elif a<=59 and a>=0:
    print("不及格")
   
else:
    print("輸入錯誤")