bash-pure, 70 bytes

Result

WA

Code [DL]

while[read -n1 C]{++a[C]};for((;i++<10)){;for((j=a[i];j--)){o+=$i}};$o

stdin

9169185577308015832561192846303841722984936290427407858839752974861071250637299581073458910965569281

stdout

stderr

/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
/code.bash: line 1: syntax error near unexpected token `;'
/code.bash: line 1: `while[read -n1 C]{++a[C]};for((;i++<10)){;for((j=a[i];j--)){o+=$i}};$o'

strace