(4 points) The following grammar discussed in class is for constructing numbers: 0 121 314151671819 Numbers with leading zeros such as 007 belong to the above grammar. Change the grammar so that numbers with leading zeros cannot be derived from the new grammar; however, number 0 itself should still be allowed. As a sanity check, make sure numbers such as 70 and 107 belong to your grammar, while numbers such as 070 do not