food_choice =  input("1.吃水果；2.吃牛排；3.吃零食。请选择：")
if food_choice == "1":
    print("早餐吃水果，补充维C快成长")
elif food_choice == "2":
    print("早餐吃牛排，一定要适量")
elif food_choice == "3":
    print("早饭吃零食，非常不健康")
else:
    print("输入错误，请重新输入")