#include <iostream>
using namespace std;

int main()
{
	int a,b;
	cin>>a>>b;
	int s=0;
	for(int i=a;i<=b;i++)
	{
		while(i)
		{
			int di=i%10;
			if(di>=0&&di<=9)
			{
				s++;
			}
			i/=10;
		}
	}
	cout<<s;
	return 0; 
}