def count_steps(splitting="OVRVO"):
    """Computes the number of O, R, V steps in the splitting string"""
    n_O = sum([step == "O" for step in splitting])
    n_R = sum([step == "R" for step in splitting])
    n_V = sum([step == "V" for step in splitting])
    return n_O, n_R, n_V