<img width="846" alt="screenshot 2017-04-28 10 46 52" src="https://cloud.githubusercontent.com/assets/22894897/25531429/03b874ec-2c00-11e7-9c07-6d8391e297ee.png"> program working:  exit: <img width="596" alt="screenshot 2017-04-28 10 51 11" src="https://cloud.githubusercontent.com/assets/22894897/25531607/c03d5f56-2c00-11e7-98f8-98d2e7eab4ae.png"> gif: 
program working:
exit:
gif: