#include<bits/stdc++.h>
using namespace std;
int main(){
  int a,b;
  string x,y;
  cin>>a>>b;
  x = to_string(abs(a));
  y = to_string(abs(b));
  if(a>0)
    sort(x.begin(),x.end(),greater<>());
  else
    sort(x.begin(),x.end());
  if(b>0)
    sort(y.begin(),y.end());
  else
    sort(y.begin(),y.end(),greater<>());
  for(int i=0;i<y.length();i++){
    if(y[i]!='0'){
      swap(y[i],y[0]);
      break;
    }
  }
  if(a!=0) a /= abs(a);
  if(b!=0) b /= abs(b);
  a *= stoi(x);
  b *= stoi(y);
  cout<<a-b<<endl;
  return 0;
}