There are six persons viz. W, X, Y, Z, A and B; all are of different heights but not necessarily in the same order. X’s height is 180 cm and he is taller than W, whose height is 172 cm but shorter than A, whose height is 194
cm. B’s height is 155 cm and he is taller than Y, whose height is 148 cm but shorter than Z, whose height is 167
cm. W is taller than Z. Who is the shortest among all?