def standardize_positions(s: str) -> str:
    """Standardizes position names
    
    Args:
        s (str): the position string

    Returns:
        str: the standardized string

    """
    mapping = {'Def': 'DST', 'Defense': 'DST', 'DEF': 'DST', 'def': 'DST', 'dst': 'DST', 'PK': 'K', 'Kicker': 'K'}
    std = mapping[s] if s in mapping else s
    return std