Question
Alexa and Strings
Alexa loves to play with strings. She is given a string S consisting of lowercase English letters.
If 'a' appears in S, print the last index at which it appears; otherwise, print −1. (The index starts at 1. )
If 'a' appears in S, print the last index at which it appears; otherwise, print −1. (The index starts at 1. )
Input
The input contains only one string.
S
Constraints
1 <= |S| <= 100
S
Constraints
1 <= |S| <= 100
Output
Print the answer.
Example
Sample Input 1
abcdaxayz
Sample Output 1
7
Sample Input 2
bcbbbz
Sample Output 2
-1
abcdaxayz
Sample Output 1
7
Sample Input 2
bcbbbz
Sample Output 2
-1