The steps
1. store the letters in the alphabet
2. get the first n letters of the alphabet
3. draw the middle line
4. get the length of the middle line
5. draw the left side of the upper half and join it to the right side - join the values together by "-" and center n-i and make sure the line is length of middle with the other values made up with "-". 
6. flip the upper half upside down to draw the bottom half
7. put it all together