#include <cstdio>
#include <iostream>
#include <cstdlib>
#include <algorithm>
#include <cstring>
#include <cmath>
#define maxb 15
using namespace std;
typedef long long ll;

ll l,r;
ll dp[maxb][15][15][2][2][2];
ll b[maxb],len;

ll dfs(ll pos,ll lst,ll llst,bool rep,bool four,bool eight,bool limit)
{
    if(!pos)
        return ((!eight)||(!four))&&rep;
    if(~dp[pos][lst][llst][rep][four][eight] && !limit)
        return dp[pos][lst][llst][rep][four][eight];
    ll re=0;
    for(register ll i=0;i<=(limit?b[pos]:9);++i)
        re+=dfs(pos-1,i,lst,rep||((i==lst)&&(lst==llst)),four||(i==4),eight||(i==8),limit&&(i>=b[pos]));
    if(!limit)
        dp[pos][lst][llst][rep][four][eight]=re;
    return re;
}

ll Work(ll num)
{
    if(num<1e10)
        return 0;
    memset(dp,-1,sizeof(dp));
    memset(b,0,sizeof(b));
    len=0;
    while(num)
    {
        b[++len]=num%10;
        num/=10;
    }
    ll re=0;
    for(register ll i=1;i<=b[len];++i)
        re+=dfs(len-1,i,10,0,i==4,i==8,i==b[len]);
    return re;
}

int main()
{
    scanf("%lld%lld",&l,&r);
    printf("%lld",Work(r)-Work(l-1));
    return 0;
}