#include<bits/stdc++.h>
using namespace std;
int a,b,s[10],cnt;
int xing(int n){
	int ret = 0,i = 0;
	while(n>0){
		s[i] = n%10;
		n = n/10;
		i++;
	}
	sort(s,s+i);
	for(int j = 0;j<i;j++){
		if(s[j]!=j){
			return 0;
		}
	}
	return 1;
}
int main(){
	cin>>a>>b;
	for(int i = a;i<=b;i++){
		memset(s,0,sizeof(0));
		if(xing(i))cnt++;
	}
	cout<<cnt;
	return 0;
}