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This is what a typical question screen looks like: 
- When you want to run your code for custom input, you need to click on the - Run codebutton.
- When you want to submit your code for evaluation against test cases, you need to click on the - Run testsbutton.
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When running your code against custom input or against test cases please make sure to print/log the answer instead of returning it as a value. Please make sure to learn how to print/log with your preferred programming language beforehand. You can refer to the following table for some commonly used languages. 
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Printing unwanted or ill-formatted data to output will cause the test cases to fail. - Make sure to remove unwanted space. For example: - 5,6and- 5, 6will be treated as different answers.
- Mind the case of the test as test cases are not case-insensitive. For example: - Hello Worldand- hello worldwill be treated as different answers.
 

