TF Problem#10941
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TF Problem

1 second
128 megabytes
Easy

Given a string of length , consisting of a block of characters followed by a block of characters, find the index of the last character or print if is not present in the string.

Character indexing in the string starts from .

Input

One string containing no more than 10^6 characters.

Output

Print the index of the last character. If the string does not contain , print .

Examples

Example 1

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Example 2

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