Are there any functions that will return the index of the last string in a cell of strings?

cell = {'a','a','b','b','c','c'}

function (cell, 'a') returns 2

function (cell, 'b') returns 4

function (cell, 'c') returns 6

Answer 1

[David Hill]

find(ismember(cell,'a'),1,'last');

[Daniel Zintsmaster]

thanks so much