if there is a sample of bacteria and there was a mixture of some rod like shaped and some spherically shaped.

if there is a sample of bacteria and there was a mixture of some rod like shaped and some spherically shaped..... if using only the gram stain tech, how many diff types of bacteria could one be able to identify in this sample? what is the reasoning for this answer?

Using only the Gram stain technique, how many types of bacteria could you identify in the sample? Explain your reasoning.