def escape(st):
    """
    Escapes the characters ``\\\\``, ``\\t``, ``\\n``, ``\\r`` and ``"`` in
    the given string ``st`` and returns it.
    """
    return st.replace('\\', r'\\')\
             .replace('\t', r'\t')\
             .replace('\r', r'\r')\
             .replace('\n', r'\n')\
             .replace('\"', r'\"')