Total number of optically active naturally occuring amino acids obtained upon complete hydrolysis of the following poiypeptide.

Amino acids obtained by complete hydrolysis of the given polypeptide are$$\begin{gathered} \left.\begin{array}{r}\mathrm{Alanine} \\ \mathrm{Glycine} \\ \mathrm{Glutamic} \\ \mathrm{Isoleucine} \\ \mathrm{leucine} \\ \mathrm{Phenyl} \mathrm{alanine} \\ \mathrm{Proline}\\ \end{array}\right\}\to \mathrm{All} \mathrm{are} \mathrm{naturally} \mathrm{occurring} \mathrm{amino} \mathrm{acid} \\ \mathrm{and} \mathrm{are} \mathrm{optically} \mathrm{ac}ti\mathrm{ve} (\mathrm{Except} \mathrm{glycine}) \end{gathered}$$