a=input("输入您的成绩:")
c=int(a)
if c >=90 and c <=100:
print("本次考试为A")
elif c>=80 and c<90:
print("本次考试等级为B")
elif c >= 70 and c < 80:
print("本次考试等级为C")
elif c >= 60 and c < 70:
print("本次考试等级为D")
else:
print("本次考试等级为E")
a=input("输入您的成绩:")
c=int(a)
if c >=90 and c <=100:
print("本次考试为A")
elif c>=80 and c<90:
print("本次考试等级为B")
elif c >= 70 and c < 80:
print("本次考试等级为C")
elif c >= 60 and c < 70:
print("本次考试等级为D")
else:
print("本次考试等级为E")