if 循环

age_of_princal = 56
guess_age = int(input(">>:"))

if guess_age == age_of_princal:
    print("Yes,you got it.")
else:
    print("No,it's wrong.")

age_of_princal = 56
guess_age = int(input(">>:"))

if guess_age == age_of_princal:
    print("Yes,you got it.")
elif guess_age > age_of_princal:
    print("You shoud try samller.")
else:
    print("You try bigger.")

score = int(input("score:"))

if score > 90:
    print("A")
elif score > 80:
    print("B")
elif score > 60:
    print("C")
else:
    print("D")