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$line = "whatever your want to print"
printf "$line" | perl -ne ' @x = split("",$_); print "$_\n" foreach(@x); '

just type
perl -v
on your command line
if it gives output like this, you are good to use the command line provided by me in the other comment

perl -v

This is perl, v5.10.1 (*) built for...

if it's ok to use perl

$ printf "abc def ghi" | perl -ne ' @x = split("",$_); print "$_\n" foreach(@x); '
a
b
c

d
e
f




g
h
i