CodeQuest
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Solve one problem at a time, in any language.

The same problem, solvable in 19 languages — read from standard input, print to standard output. New here? Start with Learn.

#TitleDifficultyTopics
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How judging works: your program reads from stdin and prints to stdout. Hit Submit to check against all hidden test cases. 
Run your code to see output here.

Pick a language. Learn it from zero.

Each course is a short, hands-on guide — run every example right in the page. Sign in to save your progress.

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Editable — change it and run again 
Output appears here.