Each of W,X,Y,Z,A,B and C has a wedding to attend on a different day of a week starting from Monday to staurday of the smae week. C has to attend wedding immediately after A. Y has to attend a wedding on one of the days before B ans W. Only Z has to attend a wedding before A, X has to attend a wedding on Friday.B does not have to attend a wedding on sunday. On which day of the week does Y have to attend a wedding?