//luogu :xmy201315 welcome to chat with me
#include <bits/stdc++.h>
using namespace std;
#define rep(i,l,r) for(int i=l;i<=r;i++)
#define per(i,l,r) for(int i=l;i>=r;i--)
int main(){
	int a,b,ans=0;
	cin>>a>>b;
	rep(i,a,b){
		int x=i,a[200],l=0,b[200],f=1;
		while(x)a[++l]=x%10,x/=10;
		memset(b,0,sizeof(b));
		rep(i,1,l)b[a[i]]++;
		rep(i,0,l-1)
			if(!b[i]){
				f=0;
				break;
			}
		if(f)ans++;
	}
	cout<<ans<<'\n';
}
//^_^,AC