We say that a natural number is *upward* if its digits fulfill
the following property: on the right of a 0 can only be a 1, on the
right of a 1 can only be a 2, on the right of a 2 can only be
a 3, …, on the right of a 8 can only be a 9 and on the right of
a 9 can only be a 0.
For instance, 34567 and 8901 are upward, but 1223 and 245 are not.

Your task is to write a program that, given a sequence of natural numbers, indicates if this contains two or more consecutive upward numbers.

Your program must include the function

Public test cases

**Input**

1234 4321 4554 2345 8901 123 6784

**Output**

YES

**Input**

**Output**

NO

**Input**

90 0

**Output**

YES

Information

- Author
- Professorat de P1
- Language
- English
- Translator
- Carlos Molina
- Original language
- Catalan
- Other languages
- Catalan
- Official solutions
- C++
- User solutions
- C++