How can I align 2 arrays?

[Lucas]

Thanks again, but I tried:

str a1=
AA
BB
FF
GG
HH

str a2=
CC
DD
EE
FF
GG

and the result:

a[0]= AA
a[1]=
a[2]= BB
a[3]=
a[4]=
a[5]= FF
a[6]=
a[7]= GG
a[8]=
a[9]= HH

b[0]=
b[1]= CC
b[2]=
b[3]= DD
b[4]= EE
b[5]=
b[6]= FF
b[7]=
b[8]= GG
b[9]=