#include<bits/stdc++.h>
using namespace std;

int a,b,s[1000001],n,ans,y,aa[9000001],f,d[9],k,i,j,g;

int main(){
	cin>>a>>b;
	y=0;f=0;
	ans=0;n=b;
	
	if(a>=b)f=1;
	while(b>0){
		if(f==1)break;
		y++;b=b/10;
		}
	for(i=a;i<=n;i++){
		if(f==1)break;
		for(g=2;g<=y;g++){
			s[g]=n%10;n=n/10;
			for(j=0;j>=y;j++){
				for(k=0;k<=9;k++)d[k]=k;
				if(s[g]==d[k-y]) ans++;
				
			}
		}
	}
	if(f==1)cout<<"NO";
	else cout<<ans;
return 0;
}