Matlab - How to sort alphabetically without using sort

clear;

A='FDLERNOPWGAKQMYU'

a=double(A);

n=length(a);

for i=1:n

    for j=1:n-i

        if a(j)>a(j+1)

            aux=a(j);

            a(j)=a(j+1);

            a(j+1)=aux;

        end

    end

end

a=char(a)

>> ordenar_letras

A =

FDLERNOPWGAKQMYU

a =

ADEFGKLMNOPQRUWY

clear;

A = 'JIK';

B = 'ABA';

C = 'ABB';

D = 'DGD';

N={A, B, C, D};

for m=1:length(N)-1

    b=double(N{m});

    c=double(N{m+1});

    n=min([length(b),length(c)]);

    for i=1:n

        for j=1:n

                     if b(j)>c(j)

                         temp=N{m};

                         N{m}=N{m+1};

                         N{m+1}=temp;

                        break;

                end

        end

    end

end

N

>> ordenar_palabras

N =

    'ABA'    'ABB'    'DGD'    'JIK'