int seaLevel = 0;
        int valleyCount = 0;

        for (char step : path.toCharArray()) {

                if (step == 'U') {

                        seaLevel++;

                        if (seaLevel == 0) {

                                valleyCount++;
                        }
                } else {

                        seaLevel--;
                }
        }

        return valleyCount;