#include<bits/stdc++.h>
using namespace std;
int a,b;
int sum;
int top;
int wei[10];
bool ok(int x){
	top = 0;
	while(x){
		wei[++top] = x % 10;
		x /= 10;
	}
	sort(wei + 1,wei + top + 1);
	for(int i = 1;i <= top;i++){
		if(wei[i] != i - 1){
			return false;
		}
	}
	return true;
}
int main(){
	scanf("%d%d",&a,&b);
	for(int i = a;i <= b;i++){
		if(ok(i)){
			sum++;
		}
	}
	printf("%d",sum);
	return 0;
}