#include<bits/stdc++.h>
using namespace std;
bool pd(int num){
	int nn = num;
	int sz[10],i = 0;
	while(num){
		sz[i] = num % 10;
		num /= 10;
		i++;
	}
	sort(sz,sz + i);
	for(int j = 0;j < i;j++){
		if(sz[j] != j){
			return 0;
		}
	}
	return 1;
}
int main(){
	int a,b,sum = 0;
	cin >> a >> b;
	for(int i = a;i <= b;i++){
		if(pd(i)){
			sum++;
		}
	}
	cout << sum;
	return 0;
}