bash-pure, 69 bytes

Result

WA

Code [DL]

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

stdin

1106257831362124571525312595851980886314425870783260303567558904203475038400044649285319896691595316

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