输入验证规则：A/B + 数字，成功修改文件

• 日期: 2024-12-09
• 标签: 常规

1. The first character of the input must be either 'A' or 'B'.
2. The second character must be a number.
3. If the first character is incorrect, display 'L' as the information.
4. If the second character is incorrect, display 'M' as the information.
5. If both characters are input correctly, the file will be successfully modified.

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