#include <bits/stdc++.h> 
using namespace std ;
int q[10000] ;
int main ( ) {
	long long a , b , cnt = 0 ;
	cin >> a >> b ;
	for ( long long i = a ; i <= b ; ++ i ) {
		for ( int i = 0 ; i <= 10000 ; ++ i ) {
			q[i] = 0 ;
		}
		long long t = i , c = i ;
		int d = 0 ;
		bool b = 0 ;
		long long o = 0 ;
		while ( t ) {
			int k = t % 10 ;
			o ++ ;
			d = k ;
			q[k] ++ ; 
			t /= 10 ;
		}
		if ( d == 0 ) {
			continue ;
		}
		for ( int i = 0 ; i < o ; ++ i ) {
			if ( q[i] == 1 ) {
				b = 1 ;
			} else {
				b = 0 ;
				break ;
			}
		}
		if ( b == 1 ) {
			++ cnt ;
		}
		
	}
	cout << cnt ;
	return 0 ;
}

/*






*/