#include<bits/stdc++.h>
using namespace std;
int main(){
	int a, b, num = 0;
	cin >> a >> b;
	for(int i = a; i <= b; i++){
		int copy = i;
		vector<int>wei;
		while(copy != 0){
			wei.push_back(copy % 10);
			copy /= 10;
		}
		sort(wei.begin(), wei.end());
		bool flag = true;
		for(int j = 0; j < wei.size(); j++)
			if(wei[j] != j)
				flag = false;
		if(flag)
			num++;
	}
	cout << num;
	return 0;
}