Task: Data-transform-pbe (source dataset: Transformation-text)

You are given a input table where each row is an input record, and an output table that contains one additional column, called "Output", whose values in each row can be produced by transforming values of the same row in the input table. Your task is to write the corresponding code that can perform such transformations, based on the given input-output examples. Make sure that the transformations you write can generalize to additional input examples not shown in the input table.

Implementation Details:
1. Generate Python code using the Pandas library to perform the transformation.
2. The code should read the input table from "input.csv".
3. Apply the transformation based on the observed pattern.
4. Save the transformed output to "output.csv".
5. Ensure that the output structure matches the expected format, including column names and data types.

Your task is to ensure that the Python script is correctly formatted, efficient, and ready for execution on any dataset following the same transformation pattern.

No explanation and return the Python code in a markdown code block: ```python
<PYTHON-CODE>
```.

Input Table:
| Input                                                                                                             |
|:------------------------------------------------------------------------------------------------------------------|
| IE/9.1 (MacOS XP 3.1; rv:33.0) Mobile/01.31.49 Gecko/91.90.81.54 Version/32.30.35                                 |
| Mozilla/8.0 (Macintosh 8.7; Linux x86_64) CriOS/84.05.19.08 Firefox/27.35 Mobile/66.07 OPR/15.28.90               |
| Netscape/7.8 (Unix 2.5; Intel OS X; rv:17.7) CriOS/57.09.73.87 AppleWebKit/69.66 Version/45.20.82.61 OPR/56.41.71 |
| Mozilla/4.3 (X11 LTE 1.3; Linux x86_64; rv:44.2) AppleWebKit/73.61 Gecko/35.78                                    |
| Firefox/0.3 (X11 X 2.2; WOW64) OPR/95.17.11 Version/36.56.57.49 Mobile/06.84 OPR/10.31.29                         |
| Chrome/3.7 (iPhone; rv:11.1) CriOS/69.86 Chrome/82.48.39.33 Safari/63.79.01                                       |
| Firefox/8.6 (Macintosh XP; rv:61.9)                                                                               |
| Chrome/5.6 (Linux) Mobile/90.94.38 Safari/36.03                                                                   |
| Netscape/6.4 (X11 XP 3.9; Ubuntu) Mobile/15.43.34.04 AppleWebKit/03.47.31                                         |
| Firefox/2.2 (MacOS; rv:54.9) Gecko/87.15 Safari/57.71.54.84 AppleWebKit/86.33.94                                  |
| Netscape/9.0 (Linux; rv:67.9) (KHTML, like Gecko)66.06.69.31 (KHTML, like Gecko)19.72 OPR/15.26 Firefox/10.44.09  |
| Chrome/7.3 (X11 SE; rv:75.3) Gecko/14.52 Safari/16.56.30.08 OPR/22.41.84 CriOS/29.60.99                           |
| Mozilla/3.9 (MacOS 4.0; Linux x86_64; rv:17.7) Chrome/42.08 Firefox/72.35.92.17                                   |
| IE/5.8 (Macintosh; Win64) Chrome/66.58 Safari/56.05.91 AppleWebKit/90.30                                          |
| Chrome/6.5 (Windows 5.5; Linux x86_64) Safari/21.44 CriOS/29.05.99.06                                             |
| Chrome/3.2 (Linux; rv:74.1) OPR/76.05.49 Chrome/67.22                                                             |
| IE/8.6 (X11) (KHTML, like Gecko)91.48                                                                             |
| IE/0.4 (iPhone SE; rv:26.5) Gecko/76.93                                                                           |
| Firefox/2.6 (Linux SE; rv:50.0) Chrome/23.57 OPR/79.20                                                            |
| Chrome/2.9 (X11) Mobile/37.95                                                                                     |
| IE/2.1 (iPhone X; rv:82.4)                                                                                        |
| Mozilla/0.0 (MacOS; Ubuntu; rv:03.8)                                                                              |
| Netscape/0.0 (iPhone X; rv:25.3) Gecko/17.82.18.42 (KHTML, like Gecko)05.87 Version/64.44.65.84                   |
| Mozilla/2.4 (Windows; rv:04.7) AppleWebKit/69.20.17 Chrome/44.23.20 AppleWebKit/16.62.10 Firefox/37.24            |
| Netscape/6.9 (X11; Intel OS X)                                                                                    |

Output Table:
| Input                                                                                                             | Output        |
|:------------------------------------------------------------------------------------------------------------------|:--------------|
| IE/9.1 (MacOS XP 3.1; rv:33.0) Mobile/01.31.49 Gecko/91.90.81.54 Version/32.30.35                                 | MacOS XP 3.1  |
| Mozilla/8.0 (Macintosh 8.7; Linux x86_64) CriOS/84.05.19.08 Firefox/27.35 Mobile/66.07 OPR/15.28.90               | Macintosh 8.7 |
| Netscape/7.8 (Unix 2.5; Intel OS X; rv:17.7) CriOS/57.09.73.87 AppleWebKit/69.66 Version/45.20.82.61 OPR/56.41.71 | Unix 2.5      |
| Mozilla/4.3 (X11 LTE 1.3; Linux x86_64; rv:44.2) AppleWebKit/73.61 Gecko/35.78                                    | X11 LTE 1.3   |
| Firefox/0.3 (X11 X 2.2; WOW64) OPR/95.17.11 Version/36.56.57.49 Mobile/06.84 OPR/10.31.29                         | X11 X 2.2     |
| Chrome/3.7 (iPhone; rv:11.1) CriOS/69.86 Chrome/82.48.39.33 Safari/63.79.01                                       | iPhone        |
| Firefox/8.6 (Macintosh XP; rv:61.9)                                                                               | Macintosh XP  |
| Chrome/5.6 (Linux) Mobile/90.94.38 Safari/36.03                                                                   | Linux         |
| Netscape/6.4 (X11 XP 3.9; Ubuntu) Mobile/15.43.34.04 AppleWebKit/03.47.31                                         | X11 XP 3.9    |
| Firefox/2.2 (MacOS; rv:54.9) Gecko/87.15 Safari/57.71.54.84 AppleWebKit/86.33.94                                  | MacOS         |
| Netscape/9.0 (Linux; rv:67.9) (KHTML, like Gecko)66.06.69.31 (KHTML, like Gecko)19.72 OPR/15.26 Firefox/10.44.09  | Linux         |
| Chrome/7.3 (X11 SE; rv:75.3) Gecko/14.52 Safari/16.56.30.08 OPR/22.41.84 CriOS/29.60.99                           | X11 SE        |
| Mozilla/3.9 (MacOS 4.0; Linux x86_64; rv:17.7) Chrome/42.08 Firefox/72.35.92.17                                   | MacOS 4.0     |
| IE/5.8 (Macintosh; Win64) Chrome/66.58 Safari/56.05.91 AppleWebKit/90.30                                          | Macintosh     |
| Chrome/6.5 (Windows 5.5; Linux x86_64) Safari/21.44 CriOS/29.05.99.06                                             | Windows 5.5   |
| Chrome/3.2 (Linux; rv:74.1) OPR/76.05.49 Chrome/67.22                                                             | Linux         |
| IE/8.6 (X11) (KHTML, like Gecko)91.48                                                                             | X11           |
| IE/0.4 (iPhone SE; rv:26.5) Gecko/76.93                                                                           | iPhone SE     |
| Firefox/2.6 (Linux SE; rv:50.0) Chrome/23.57 OPR/79.20                                                            | Linux SE      |
| Chrome/2.9 (X11) Mobile/37.95                                                                                     | X11           |
| IE/2.1 (iPhone X; rv:82.4)                                                                                        | iPhone X      |
| Mozilla/0.0 (MacOS; Ubuntu; rv:03.8)                                                                              | MacOS         |
| Netscape/0.0 (iPhone X; rv:25.3) Gecko/17.82.18.42 (KHTML, like Gecko)05.87 Version/64.44.65.84                   | iPhone X      |
| Mozilla/2.4 (Windows; rv:04.7) AppleWebKit/69.20.17 Chrome/44.23.20 AppleWebKit/16.62.10 Firefox/37.24            | Windows       |
| Netscape/6.9 (X11; Intel OS X)                                                                                    | X11           |



filename: UserAgent.000007
instruction: Substring
example_input: example_input.csv
example_output: example_output.csv
test_input: test_input.csv
test_output: test_output.csv