#include<bits/stdc++.h>
using namespace std;
int check(int n)
{
int a[8]={0},p=0,b;
while(n!=0)
{
b=n%10;
a[b]=1;
p++; 
n=n/10;
}
for(int i=0;i<=p-1;i++)if(a[i]==0)return 0;
return 1;
}
int main()
{
int i,a,b,z=0;
cin>>a>>b;
for(i=a;i<=b;i++)
if(check(i)==1)z++;
cout<<z;
return 0;
}