Score: $150$ points

问题描述

你将得到一个由小写英文字母组成的字符串 $S$。字符串 $S$ 的长度介于 $3$ 到 $100$（包含两端点）之间。

$S$ 中除一个字符外，所有其他字符都相同。

请找出索引为 $x$ 的字符，该字符与 $S$ 中的其他所有字符不同。

以上为通义千问 qwen-max 翻译，仅供参考。

Problem Statement

You are given a string $S$ consisting of lowercase English letters. The length of $S$ is between $3$ and $100$, inclusive.

All characters but one of $S$ are the same.

Find $x$ such that the $x$-th character of $S$ differs from all other characters.

Constraints

• $S$ is a string of length between $3$ and $100$, inclusive, consisting of two different lowercase English letters.
• All characters but one of $S$ are the same.

Input

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

$S$

Output

Print the answer.

Sample Input 1

yay

Sample Output 1

2

The second character of yay differs from the first and third characters.

Sample Input 2

egg

Sample Output 2

1

Sample Input 3

zzzzzwz

Sample Output 3

6

update @ 2024/3/10 01:35:45