#include<iostream>
#include<cmath>
using namespace std;
int main()
{
  int pocetok;
  int kraj;
  int cifra;
  int cifra2;
  int soplus;
  int sominus;
    int sominus2;
  int zbir=0;
  cin>>pocetok>>kraj;
  while(kraj>0){
    cifra=pocetok%10;
    cifra2=kraj%10;
    soplus=abs(cifra2-cifra);
    sominus=abs(10-cifra+cifra2);
      sominus2 = abs(10 - cifra2 + cifra);
      if(sominus2 < sominus) {
          sominus = sominus2;
      }
    if(soplus<sominus){
        zbir+=soplus;
    }
    else zbir+=sominus;
      pocetok/=10;
    kraj/=10;


  }
  cout<<zbir<<endl;
 return 0;
}