read a
c=${#a}
eval b=({0..$c})
for((;c;)){
for((d=0;d<c;)){
[[ ${a:b[e=d]} < ${a:b[++d]} ]]&&$[b[e]^=b[d],b[d]^=b[e],b[e]^=b[d]]
}
echo "${a:b[--c]}"
}