A0, B0, C0 = map(str, input().split('.'))
A1, B1, C1 = map(str, input().split('.'))
Version0 = f"{A0.zfill(3)}{B0.zfill(3)}{C0.zfill(3)}"
Version1 = f"{A1.zfill(3)}{B1.zfill(3)}{C1.zfill(3)}"
if Version0 >= Version1:
  print("YES")
else:
  print("NO")