#include<stdio.h>
int main(){
    int beg,end;
    int ans=0;
    int m[13]={0,31,29,31,30,31,30,31,31,30,31,30,31};
    scanf("%d%d",&beg,&end);
    int a,b,flag=0;
    a=beg/10000;
    b=end/10000;
    for(int i=a;i<=b;i++){
        int tmp=i;
        flag=0;
        while(tmp>0){
            flag=flag*10+tmp%10;
            tmp/=10;
        }
        if(tmp/100<=12&&tmp/100>=1){
            if(tmp%100>0&&tmp%100<=m[tmp/100])
            ans++;
        }
    }
    printf("%d",ans);
    
    return 0;
}