# def print_hello_world(): #def keyword
# #definition of the function
#     #Body of the function
#     print("hello world")
#     print("GO home")
#     print("Monday")
# #calling the function
# print_hello_world()


# q=list(range(1,7))
# #print(q)
# r=list(range(10,71))
# #print(r)
# s=list(range(1000,2000,100))
# #print(s)
#
# def get_index1(a):
#     print(a[0])
#
# get_index1(q)
# get_index1(r)
# get_index1(s)

# name=input("Enter name:-")
#
# def printFunc(name):
#     print("Your name is ",name)
#
# printFunc(name)


# num1=int(input("Enter num1:-"))
# num2=int(input("Enter num2:-"))
#
# def sub_two_numbers(num1,num2):
#     result= num1-num2
#     return result
#
# res=(sub_two_numbers(num1,num2))#+1234567
# print(res)

# name=input("Enter name:-")
#
# def hello_name(name):
#
#   return "Hello {}!".format(name)
#
# g=hello_name(name)
# print(g)

s = input()
if s.lower() == 'yes':   # lower function returns all lowercase letters in the string
    print('Yes')
else:
    print("No")