Eight teachers – S, T, U, V, W, X, Y, and Z were seated around a circular table facing centre. No two persons were seated together according to the English alphabetical order. S was seated second to the left of T and to the immediate right of U. Y was seated second to the right of W. One person was seated between Y and Z when counted from the right of Y. V and Y were immediate neighbours. How many persons were seated between W and X when counted from the left of X?