We were provided with a bulk of 1,207 face images. After an initial quick glance look into all images,
we solved this challenge most probably in a non-intended way. By running `exiftool` against all images
and sorting the results by number of repetitions, attribute `Exif Byte Order` stood out:

```sh
exiftool * | sort | uniq -c | sort -n

...
1 ======== 999.jpg
1 ======== 99.jpg
1 ======== 9.jpg
1 Exif Byte Order : Big-endian (Motorola, MM)
1 File Modification Date/Time : 2020:06:06 21:39:50+02:00
1 File Name : 0.jpg
1 File Name : 1000.jpg
...

```

----

For a bulk of images, which all should be preprocessed in an uniform way, this was quite "interesting". In
subsequent run found that the corresponding image was `1145.jpg`:

```
$ exiftool * | grep -C 15 "Exif Byte Order"
Y Cb Cr Sub Sampling : YCbCr4:2:0 (2 2)
Image Size : 2444x1718
Megapixels : 4.2
======== 1145.jpg
ExifTool Version Number : 11.88
File Name : 1145.jpg
Directory : .
File Size : 56 kB
File Modification Date/Time : 2020:06:06 21:39:50+02:00
File Access Date/Time : 2020:07:03 13:51:49+02:00
File Inode Change Date/Time : 2020:07:02 12:18:18+02:00
File Permissions : rw-r--r--
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
Exif Byte Order : Big-endian (Motorola, MM)
Orientation : Horizontal (normal)
X Resolution : 300
Y Resolution : 300
Resolution Unit : inches
JFIF Version : 1.01
Image Width : 2444
Image Height : 1718
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:2:0 (2 2)
Image Size : 2444x1718
Megapixels : 4.2
======== 1146.jpg
ExifTool Version Number : 11.88
```

----

Flag (`cscml2020{ml_can_be_learned_easily_by_examples}`) is visible at the bottom of the image (`1145.jpg`):