s1 = input()
s2 = input()
s3 = input()
if s1[0] and s3[0] == s1[2] and s3[2]:
	S = True
if s2 != s1 and s2[0] == s2[2] and s2[0] != s2[1]:
    SS = True
if S and SS == True:
	print('Yes')
else:
	print('No')