def pdzf():
    a=input("请输入yes: ")
    if a=="yes" or a=="Yse" or a=="YES":
        print("Yse")
    else:
        print("No")
pdzf()
class Pdzf:
    def pd(self):
        a=input("请输入yes: ")
        if a=="yes" or a=="Yes" or a=="YES":
            print("Yes")
        else:
            print("No")
zifu=Pdzf()
zifu.pd()