#include<bits/stdc++.h>
#define int long long
#define deg(a) cout << #a << " = " << a << "\n";
#define de(a) cout << #a << " = " << a << " ";
#define x first
#define y second
using namespace std;
const int N=20;
int f[N][10];
int dp(int t)
{
    vector<int> num;
    num.push_back(t%10),t/=10;
    while(t)num.push_back(t%10),t/=10;
    int res=0;
    int ls=0;
    for(int i=num.size()-1;~i;i--)
    {
        int x=num[i];
        for(int j=0;j<x;j++)
        {
            if(ls==6&&j==2)continue;
            if(j==4)continue;
            res+=f[i+1][j];
        }
        if(x==2&&ls==6||x==4)break;
        ls=x;
        if(!i)res++;
    }
    return res;
}
void init()
{
    for(int i=0;i<10;i++)
    {
        if(i==4)continue;
        f[1][i]=1;  
    }
    for(int i=2;i<N;i++)
        for(int j=0;j<10;j++)
            for(int k=0;k<10;k++)
            {
                if(j==4||k==4)continue;
                if(j==6&&k==2)continue;
                f[i][j]+=f[i-1][k];
            }
}
void sol(int l,int r)
{
    cout<<dp(r)-dp(l-1)<<endl;
}
signed main()
{
    int l,r;
    init();
    while(cin>>l>>r,l&&r)
    {
        sol(l,r);   
    } 
    return 0;
}