How to reset auto increment column in mysql table

Here item_category_id is auto increment value in the mysql table. Now i need to delete all the values & next insertion should start from 1. Now if i delete all values & try to insert a new row then it starts with some 30's & 40's.

  item_category_id  item_category_name
     1                     qqq
     25                    ccc
     32                    vvv
     29                    bb
     4                     bbb
     31                    hhh
     34                    mmm
     33                    rrr
 

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