Traffic Issue

Problem description. A friend of Mohit who is a traffic inspector asked Mohit to count how many times the car crosses the auto on a one-way road. The road is represented by a string. For example: "---c-aa-ca--c-" Each road string will contain three different characters: 'c', a car moving to the right; 'a', an auto moving to the right; and '-', an empty space. A car has twice the speed of an auto