Combining two character arrays so that the elements of one of them is added in between the elements of the other one

I want to combine two character arrays

x='ABCDEFGHIJKLMNOPQRSTUVWXYZ'

and

a='AAAAAAAAAAAAAAAAAAAAAAAAAA'

so that A is alterantingly added to each letter of x. the output should look like this:

Output='AAABACADAEAFAG...AZ'

Answer 1

[Stephen23]

x = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
a = 'AAAAAAAAAAAAAAAAAAAAAAAAAA';
out = reshape([a;x],1,[])

out = 'AAABACADAEAFAGAHAIAJAKALAMANAOAPAQARASATAUAVAWAXAYAZ'

[Saeid]

Thanks, Stephen!