bash-pure, 193 bytes

Result

WA

Code [DL]

a=()
while read -n 1 c;do a+=($c);done
for((i=0;i<100;i++));do for((j=0;j<99;j++));do if [[ a[$i] > a[$j] ]];then t="${a[$i]}";a[$i]="${a[$j]}";a[$j]=$t;fi;done;done
echo $(IFS=;echo "${a[*]}")

stdin

0125266639834783384566719174229899309326174408740856180407986384703724103425047264504283263346043137

stdout

7134064333238240546174052430122730748365970408165204780447162390399896247191766648338743830526884269

stderr

/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)

strace