李宁集团于今日盘前发布公告称将会自本公告发布之日起6个月内动用不超过港元30亿的资金回购股份。公司认为现在的股价明显低于内在的实际价值，进行股票回购，充分地显示出董事会对于李宁集团的业务前景，和长期发展充
The output is always a String, for example H,E,L,L,O,. How could I limit the commas? I want the commas only between letters, for example H,E,L,L,O.
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