def score_to_rating_string(score):
    """
    Convert score to rating
    """
    if score < 1:
        rating = "Terrible"
    elif score < 2:
        rating = "Bad"
    elif score < 3:
        rating = "OK"
    elif score < 4:
        rating = "Good"
    else:
        rating = "Excellent"

    return rating