a = input()
b = input()
la = a in list("qwertyuioplkjhgfdsazxcvbnm")
lb = b in list("qwertyuioplkjhgfdsazxcvbnm")
da = a in list("1234567890")
db = b in list("1234567890")
if (la and db) or (lb and da):
    print("YES")
else:
    print("NO")