def countingValleys(steps, path):
    level = 0
    valley = False
    path_values = list(map(direction_value, path))
    valleys = 0
    
    for s in path_values:
        level += s
        if level < 0:
            valley = True
        if valley and level >= 0:
            valleys += 1
            valley = False
            
    return valleys
    
def direction_value(d):
    if d == 'U':
        return 1
    return -1