c-gcc, 68 bytes

Result

WA

Code [DL]

i;c(char*a){a=*a-*1[&a];}main(){gets(&i);qsort(&i,10,1,c);puts(&i);}

stdin

9930623403698524276097869649887790382470566654149248009458128345408262080298406227364384125527755283

stdout

3699303240698524276097869649887790382470566654149248009458128345408262080298406227364384125527755283

stderr

/tmp/code.c:1:1: warning: data definition has no type or storage class
 i;c(char*a){a=*a-*1[&a];}main(){gets(&i);qsort(&i,10,1,c);puts(&i);}
 ^
/tmp/code.c:1:1: warning: type defaults to ‘int’ in declaration of ‘i’ [-Wimplicit-int]
/tmp/code.c:1:3: warning: return type defaults to ‘int’ [-Wimplicit-int]
 i;c(char*a){a=*a-*1[&a];}main(){gets(&i);qsort(&i,10,1,c);puts(&i);}
   ^
/tmp/code.c: In function ‘c’:
/tmp/code.c:1:14: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
 i;c(char*a){a=*a-*1[&a];}main(){gets(&i);qsort(&i,10,1,c);puts(&i);}
              ^
/tmp/code.c: At top level:
/tmp/code.c:1:26: warning: return type defaults to ‘int’ [-Wimplicit-int]
 i;c(char*a){a=*a-*1[&a];}main(){gets(&i);qsort(&i,10,1,c);puts(&i);}
                          ^
/tmp/code.c: In function ‘main’:
/tmp/code.c:1:33: warning: implicit declaration of function ‘gets’ [-Wimplicit-function-declaration]
 i;c(char*a){a=*a-*1[&a];}main(){gets(&i);qsort(&i,10,1,c);puts(&i);}
                                 ^
/tmp/code.c:1:42: warning: implicit declaration of function ‘qsort’ [-Wimplicit-function-declaration]
 i;c(char*a){a=*a-*1[&a];}main(){gets(&i);qsort(&i,10,1,c);puts(&i);}
                                          ^
/tmp/code.c:1:59: warning: implicit declaration of function ‘puts’ [-Wimplicit-function-declaration]
 i;c(char*a){a=*a-*1[&a];}main(){gets(&i);qsort(&i,10,1,c);puts(&i);}
                                                           ^
/tmp/code.c: In function ‘c’:
/tmp/code.c:1:1: warning: control reaches end of non-void function [-Wreturn-type]
 i;c(char*a){a=*a-*1[&a];}main(){gets(&i);qsort(&i,10,1,c);puts(&i);}
 ^
/tmp/cc4Q2qNf.o: In function `main':
code.c:(.text.startup+0xc): warning: the `gets' function is dangerous and should not be used.

strace