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def protein_mass(sequence: str) -> float:
    """
    Calculates the mass of a protein sequence.

    Args:
        sequence (str): The protein sequence.

    Returns:
        float: The mass of the protein.

    Examples:
        >>> protein_sequence = "SKADYEK"
        >>> mass = protein_mass(protein_sequence)
        >>> print(mass)
        821.392
    """
    mass = 0
    for amino_acid in sequence:
        mass += MONOISOTOPIC_MASS_TABLE[amino_acid]
    return mass