What is the difference between the floor number of A and B?

Study the following information carefully and answer the question given below: There are seven people A, Z, B, Y, M, N, P are living in a 7 floor Building on different floors from top to bottom (such as ground floor is numbered as 1 and top floor is numbered as 7) but not necessarily in the same order. P lives on one of the odd numbered floor above Y but not on top floor. N lives immediately before B, who lives in bottom most floor. A lives on an odd numbered floor but not on the floor numbered 3. Z lives on immediately below
A. Only one person lives between Z and M and they lives on even numbered floor. P lives above
M.