#include <bits/stdc++.h>
using namespace std;
bool judge1(int n){
	int s[8] = {0},s1[11] = {0};
	int xb = 0;
	while(n!=0){
		xb++;
		s[xb] = n%10;
		n/=10;
	}
	for(int i=1;i<=xb;i++){
		s1[s[i]]++;
	}
	for(int i=0;i<xb;i++){
		if(s1[i]==0){
			return false;
		}
	}
	return true;
}
int main(){
	int a,b,ans = 0;
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		if(judge1(i)==true){
			ans++;
		}
	}
	cout<<ans;
	return 0;
}