====== GetSubIndustyD(subIndustry) ======
Return colleges which alumnus are most common working in sub industry.
====== Description ======
given a industry, count at which college's alumnus are most common working. The number of industry in mainland China is 141. For example,'银行业','房地产开发与经营','计算机应用服务业' and so on.
====== Parameter ======
sub industry: classification of listed company in mainland China.
====== Return ======
A sorted list of colleges.
====== Detail Information ======
  - given an industry
  - find people who are working in this industry
  - map people to colleges
  - count the number of colleges.
  - sort colleges.