1029: Rightmost

Memory Limit：1024 MB Time Limit：2.000 S
Judge Style：Text Compare Creator：
Submit：11 Solved：4

Description

You are given a string lns="http://www.w3.org/1998/Math/MathML">� consisting of lowercase English letters.
If a appears in lns="http://www.w3.org/1998/Math/MathML">�, print the last index at which it appears; otherwise, print lns="http://www.w3.org/1998/Math/MathML">−1. (The index starts at lns="http://www.w3.org/1998/Math/MathML">1.)

Input

The input is given from Standard Input in the following format:

S

S a string of length between 1 and 100 (inclusive) consisting of lowercase English letters.


Output

Print the answer.

Sample Input Copy 

abcdaxayz

Sample Output Copy 

7

Source/Category

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