# Complete the countingValleys function below.
def countingValleys(n, s):
    tot_valley = 0
    current_level = 0

    hike = list(s)
    for cur_step in hike:
        if cur_step == 'U':
            current_level += 1
        elif cur_step == 'D':
            if current_level == 0:
                tot_valley += 1
            current_level -= 1
    return tot_valley