@staticmethod
def extract_method_id(tx_input: str) ->str:
    """
        Extract Atomic Swap method identifier from transaction input (hash string).

        Args:
            tx_inpit: hash string with transaction input

        Returns:
            str: method identifier

        Example:
            >>> from clove.network import EthereumTestnet
            >>> network = EthereumTestnet()
            >>> network.extract_method_id('0x7337c993000000000000000000000000000000000000000000000000000000005bd1e24b6603102c4aad175d1d719326d32127d55593f986000000000000000000000000000000000000000000000000d867f293ba129629a9f9355fa285b8d3711a90920000000000000000000000004fd13283a6b9e26c4833d7b9ee7557f1d008371d0000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000002386f26fc10000')  # noqa: E501
            '7337c993'
        """
    return tx_input[2:10]
