def _vasp5_lines_species(poscar_lines):
    """Extract the number of each species of the structre
    and return the values as tuples

    Parameters
    ----------
    poscar : list of str

    Returns
    -------
    list of (str, int)

    """
    species=poscar_lines[5].split()
    num_species=poscar_lines[6].split()
    return zip(species,[int(n) for n in num_species])