As in the handout, consider a grammar for binary strings or their complements: Now, for the negated string, its decimal value is its two's complement, that is, the value of a negated string is the decimal value of the string with I's replaced by O's and 0's replaced by I's, and then added by one. For example,-010 is now 6 (because 010's two's complement is 1 10). Modify the given solution of the handout question to calculate the decimal value of an input string with above grammar