Which values occur exactly three times?

Return a list of all values (sorted smallest to largest) that appear exactly three times in the input vector x. So if
x = [1 2 5 2 2 7 8 3 3 1 3 8 8 8]
then
y = [2 3]

MATLAB CODE:

clc

clear all

close all

x=input('Enter the vector');

  w=sort(x);

  u=[];

  p=[];

  y=[];

  c=1;

  for i=1:length(w)-1

      if(w(i)==w(i+1))

          c=c+1;

      elseif(w(i)~=w(i+1))

          u=[u w(i)];

          p=[p c];

          c=1;

      end

  end

  u=[u w(length(w))];

  p=[p c];

  for j=1:length(p)

      if(p(j)==3)

          y=[y u(j)];

      end

  end

Explanation:

          

Sample Output:

Function Implementation:

function y = threeTimes(x)

w=sort(x);

u=[];

p=[];

y=[];

c=1;

for i=1:length(w)-1

if(w(i)==w(i+1))

c=c+1;

elseif(w(i)~=w(i+1))

u=[u w(i)];

p=[p c];

c=1;

end

end

u=[u w(length(w))];

p=[p c];

for j=1:length(p)

if(p(j)==3)

y=[y u(j)];

end

end

end