#include<bits/stdc++.h>
using namespace std;
int a[10000001];
int main(){
	int a,b,s=0,c=0;
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		while(b!=0){
			a[i]=i%10;
			i/10;
			s++;
		}
		if(a[i]==s) c++;
	}
	cout<<s;
	return 0;
}