Before you begin, there are a string such as "a,a,a,a,a,a,a,," in a cell
-Select the cell
-Click comma button "," and hyphen button "-". This means the commas will be replaced by hyphens in the string.
-Click "Exchange" button
-The string you selected is replaced as "a-a-a-a-a-a-a--"
-The double byte pad is usually used in Chinese string