#include<bits/stdc++.h>
using namespace std;
int sw(int s){
	int bcs=s,cs=1;
	while(bcs!=0){
		cs*=10;
		bcs/=cs;
	}
	return cs;
}
int zszh(int ws){
	int mus=sw(ws);
	int jum=0;
	for(int dum=0;dum<=mus;dum++){
		jum+=dum;
	}
	return jum;
}
int szh(int j){
	int sum=0,js=j;
	while(js!=0){
		sum+=js%10;
		js/=10;
	}
	return sum;
}
int main(){
	int a,b,num=0;
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		if(zszh(i)==szh(i)){
			num++;
		}
	}
	cout<<num;
	return 0;
}