RPT-UPDATE 2-HSBC announces surprise exit of CEO Flint, up to $1 bln buyback <!-- no image --> <div>* CEO change needed to tackle "challenging" environment- board<div class="feedflare"> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=Md0QIiDjCpk:DOww_BrMB4A:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?d=yIl2AUoC8zA" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=Md0QIiDjCpk:DOww_BrMB4A:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=Md0QIiDjCpk:DOww_BrMB4A:V_sGLiPBpWU" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=Md0QIiDjCpk:DOww_BrMB4A:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=Md0QIiDjCpk:DOww_BrMB4A:F7zBnMyn0Lo" border="0"></a> </div><img src="http://feeds.feedburner.com/~r/reuters/UKBankingFinancial/~4/Md0QIiDjCpk" height="1" width="1" alt=""></div> Posted by Reuters