Given a string S with N characters (N<8), please output all the possible string after re-arrange the 
order of the string. For example, given S="abcc", then output:
abcc
acbc
accb
bacc
bcac
bcca
cabc
cacb
cbac
cbca
ccab
ccba
Please output in ascending order!

one line with the string S

all the possible strings in ascending order, one line one string!