List = ["Yawenam","Nicola","Foster"]
#if len(List)>3:
	#print "overload"
#elif len(List)==3:
	#print "it is enough"
#else:
	#print "add more" 	
#age = input("Your age")
#print "Your age is "+ str(age)
name = raw_input ("Enter instructor name")
if name in list
   print "Yes"
else:
	print "Not an instructor"