#include <bits/stdc++.h>
using namespace std;
int a,b,us;
int main() {
scanf("%d%d",&a,&b);
for(int i = a;i <= b;i++){
	int w = i,o = 0;
	int j = 0;
	if(w / 10 == 0){
		sum = w;
		j = 1;
	}
	while(w / 10 != 0 && aus == sum){	
		if(w % 10 == 0){
		   o++;
		}
    	sum += w % 10;
	    j++;	    	
	    aus += j;
	    w /= 10;    
	}
	if(sum == aus && o == 1){
		us++;		
	}
 
} 
        printf("%d",us);


return 0;
}