This task should output the list of non-terminals followed by the list of terminals in the order in which they appear in the grammar rules from the given input file. Need this in c++

Example: For the input grammar decl-> idList colon ID # idList-> ID dList1 # dList 1-> # idList1-> COMMA ID dList 1 # the expected output for task 1 is: decl idList idList1 colon ID COMMA Example: Given the input grammar: decl-> idList colon ID # idList1-> # idList1-> COMMA ID idList1 # idList-> ID idList1 # the expected output for task 1 is: decl idList idList1 colon ID COMMA Note that in this example, even though the rule for idList1 is before the rule for idList, idList appears before idList1 in the grammar rules