in iphone 5s touch id not working .it shows ''sorry failed go back and try again"wot to do

Hey kishore_nokia,

Thanks for the question. After reviewing your post, it sounds like you are having a difficult time using Touch ID. Take a look at the troubleshooting steps in this article to try and resolve this issue.

iPhone 5s: Using Touch ID

http://support.apple.com/kb/HT5883

Resolving issues with Touch ID

1. Make sure that you're using the latest version of iOS.
2. Make sure that your fingers and the Home button are clean and dry.*
   Note: Cover the Home button completely. Don't tap too quickly, don't press down hard, and don't move your finger while Touch ID is scanning. Make sure that your finger touches the metal ring around the Home button.
3. If you're using a protective case or screen protector, it must leave the Home button and the surrounding ring completely unobscured. If it doesn't, remove the case or screen protector and try again.
4. Tap Settings > Touch ID & Passcode and verify that:
   • iPhone Unlock or iTunes & App Store is on.
   • You enrolled one or more fingerprints.
5. Try enrolling a different finger.
6. If you can't enroll any of your fingers, take your iPhone 5s to an Apple Retail Store, Apple Authorized Service Provider, or contact AppleCare for further assistance.

Thanks for using Apple Support Communities.

Have a nice day,

Mario