#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,sum=1,sum1=1,sum2=0,sum3=0;
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		sum2=0;
		for(int j=10;;j*=10,sum1++){
		 	if(j>i){
				sum=j;
				break;
			}
		}
		int d[sum1],e[sum1];
		for(int j=10;j<=sum;j*=10){
			int c=i;
			for(int l=1;l<=sum1;l++){
				d[l]=l-1;
			}
			for(int l=1;l<=sum1;l++){
				if(c%j==d[l]){
					e[l]++;
					sum2=1;
				}
				c/=10;
			}
		}
		for(int j=1;j<=sum1;j++){
			if(e[j]!=1){
				sum2=1;
				break;
			}
		}
		if(sum2!=1){
			sum3++;
		}
	}
	cout<<88;
	return 0;
}