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

3701096632058195000877792928387151401202149998738704161733769325830545623343864160344556089632820603

stdout

0629230383806554437061468343032654503815239673370161407837989994120261041517836829297778300059185062

stderr

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

strace