c-gcc, 67 bytes

Result

WA

Code [DL]

#include<string.h>
s[1];main(){qsort(gets(s),100,1,bcmp);puts(s);}

stdin

2708568287918238548312293813916084043059923095940427497141380997878293844356333560070936786992977536

stdout

stderr

/volume/CODE.c:2:1: warning: data definition has no type or storage class
 s[1];main(){qsort(gets(s),100,1,bcmp);puts(s);}
 ^
/volume/CODE.c:2:1: warning: type defaults to ‘int’ in declaration of ‘s’ [-Wimplicit-int]
/volume/CODE.c:2:6: warning: return type defaults to ‘int’ [-Wimplicit-int]
 s[1];main(){qsort(gets(s),100,1,bcmp);puts(s);}
      ^
/volume/CODE.c: In function ‘main’:
/volume/CODE.c:2:13: warning: implicit declaration of function ‘qsort’ [-Wimplicit-function-declaration]
 s[1];main(){qsort(gets(s),100,1,bcmp);puts(s);}
             ^
/volume/CODE.c:2:19: warning: implicit declaration of function ‘gets’ [-Wimplicit-function-declaration]
 s[1];main(){qsort(gets(s),100,1,bcmp);puts(s);}
                   ^
/volume/CODE.c:2:33: error: ‘bcmp’ undeclared (first use in this function)
 s[1];main(){qsort(gets(s),100,1,bcmp);puts(s);}
                                 ^
/volume/CODE.c:2:33: note: each undeclared identifier is reported only once for each function it appears in
/volume/CODE.c:2:39: warning: implicit declaration of function ‘puts’ [-Wimplicit-function-declaration]
 s[1];main(){qsort(gets(s),100,1,bcmp);puts(s);}
                                       ^
/home/esolang/bin/c-gcc: line 4: /tmp/code: No such file or directory

strace