combine lists in a certain order c#

Question

I have winform project in c# that makes math operations. The string comes like "=B10+B4*(B12-B8)". And B10 represents "3", B4 represents "10" B12 represent "6" and B8 represent "2". I want to convert this string to "=3+10*(6-2)". So math operation can be happened. For solution I created three list. I succeded to make operatorList and numberRepresentList as seen below. My problem is combining this two list with a specific order.

List<string> operatorList= new List<string>();
List<string> numberRepresentList = new List<string>();
List<string> mergedList= new List<string>();


operatorList={"=","+","*","(","-",")"}
numberRepresentList =={"3","10","6","2"}

How can i combine them with a specific order so the result will shown as:

mergedList={"=","3","+","10","*","(","6","-","2",")"}

I have searched in forms but i can not find similar one. So i created one. Thanx in advance.

Edited: Thanx to @vivek nuna. I made a list name partOfString

 comesFromUser="=B10+B4*(B12-B8)"
 partofString={"B10","B4","B12","B8"}
 numberRepresentList =={"3","10","6","2"}
    
    for (int i = 0; i < partOfString.Count; i++)
        {
         comesFromUser = comesFromUser.Replace(partOfString[i], numberRepresentList[i]);
        }

Answer 1

There could be many ways to solve this problem.

The simplest approach, you can do this.

string output = input.Replace("B10", "3").Replace("B4", "10").Replace("B12", "6").Replace("B8", "2");