#include<bits/stdc++.h>
using namespace std;

int a,b,g,s,k,js,t[1000005],js1,x,j,i;

int main(){
	js1 = 0;
	int m[105];
	cin>>a>>b;
	for(i = a;i <= b;i++){
		
	    
		k = i;
		s = 0;
		js = 0;
		while(k != 0){
			g = k % 10;
			s++;
			t[s] = g;
			k /= 10;
		}
		for(x = 0;x < s;x++){
			m[x] = 1;
		}
		for(x = 0;x < s;x++){
			for(j = 1;j <= s;j++){
				if(t[j] == x && m[x] == 1){
					js++;
					m[x] = 0;
				}
			}
		}
		if(js == s){
			
			js1++;
		}
	}
	cout<<js1<<endl;
    return 0;
}