Convert a 3-d matrix to a 2-d matrix

I have this variable 'a'. I want to convert it into a 2-d matrix of dimensions 3*3. The output I am looking for is a 3*3 matrix denoted by 'b'. Any help will be appreciated.

a=randi(10,3,3,2)

val(:,:,1) =

     1     3     8
     6     4     8
     3     1     6

val(:,:,2) =

     4    10     6
     9     9     4
     6     4     7

b =

    14 310 86

    69 49  84

    36 14  67

Answer 1

[Andrei Bobrov]

val(:,:,1) =[     1     3     8
6     4     8
3     1     6];
val(:,:,2) =[     4    10     6
9     9     4
6     4     7];
val(:,:,3) = randi([5,15],3,3)

l = floor(log10(val)+1);
ex = cumsum(l(:,:,end:-1:2),3);
c = cat(3,val(:,:,1:end-1).*10.^ex(:,:,end:-1:1),val(:,:,end))
out = sum(c,3);

or

z = num2cell(cellfun(@num2str,num2cell(val),'un',0),[1 2])
out = str2double(strcat(z{:}))

Answer 2

[Jan]

 b = zeros( size(a, 1), size(a, 2) ); 
 for i = 1 : size(a, 3); 
    b = b + 10.^(size(a, 3) - i) * a(:,:,i);  
 end;

Answer 3

[Azzi Abdelmalek]

 out=val(:,:,1).*10.^(fix(val(:,:,2)/10)+1)+val(:,:,2)

[Vishal]

Thanks. Not sure how i could implement this for when there are upto 5 dimensions i.e. a=randi(10,3,3,5)