s = input()
str_input = list(s)

ushi = 0
space = 0
for str_linput in str_input:
	if(space == 0):
		if(str_linput == ' '):
			ushi = 0
			break
		space = 1
		continue
	elif(space == 1):
		if(str_linput == ' '):
			ushi = 1
		else:
			ushi = 0
		if(ushi == 0):
			break
		space = 0
		continue
	print()

if(ushi == 1):
	print('Yes')
else:
	print('No')