include<bits/stdc++.h>

using namespace std; int y[13]={0,31,29,31,30,31,30,31,31,30,31,30,31}; int n,m; int cnt=0; int main(){

cin>>n>>m;
for(int i=1;i<=12;i++){
	for(int j=1;j<=y[i];j++){
		int per=(j%10)*1000+(j/10)*100+(i%10)*10+i/10;
		int s=i*100+j;
		int od=per*10000+s;
		if(od>=n&&od<=m) cnt++;
	}
}
cout<<cnt;

}