An offer has been given. Determine if it contains the letter "
a" (English). If the answer is yes, output the serial number of the first of them. If it is negative, output the word
NO.
Solve the problem
without using the built-in string functions, except for a function that returns the length of a string.
Input: The first line is the original sentence.
Output: print the answer to the problem.
Input and output example
| Test number |
Input |
Output |
| 1 |
foresete |
NO |
| 2 |
forast |
4 |
count;find