DEV World - Developers' changellenge

Developers' challenge

Below is a part of 50K Viettel card number 5503 xxxxx 2092. Try to guess the FIVE secret numbers then you can use that card for your cell phone. Suggestion: try to your coding skill to automatically request this url. Believe me, it's not very easy at all

Note: if you supply an email that does not belong to any account in the system, you will always receive a message as "Invalid guess". Once your guess is correct, an email should be sent to this email with the full card number. Good luck !!

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