Please add your content into the section folder. It should have the following structure:
(obviously, you should replase sections and subsectionX with the section name and the subsection name)
$ tree OCRudoku-first-defense/
OCRudoku-first-defense/
├── main.txt
├── README.txt
└── sections
├── section1
│ └── section1.tex
└── section2
├── subsection1
│ └── subsection2.tex
└── subsection2
└── subsection2.tex