C++ please

Program 3 Write a program that reads a number between 0 and 999,999,999,999 from the user, where the user enters a comma in the input. Then print the number without a comma. You should assume the user will give you a number with the commas where they should be. Hint: Read the input as a string and loop over the string. Store the result in a long variable. One way to do this is to convert to integer one character at a time. For example: string s - "324,126"; int i = s.at(2) - '0'; //This will output the integer 4, since it is the 2nd character 1/(first being character o) cout