1 #include<iostream>
 2 #include<stdio.h>
 3 #include<cstring>
 4 #include<cstdlib>
 5 using namespace std;
 6 
 7 int dp[7][10];
 8 int hxl[10],hlen;
 9 void init()
10 {
11     dp[0][0]=1;
12     for(int i=1;i<=6;i++)//枚举有几位
13     {
14         for(int j=0;j<=9;j++)//第 i 为的数字
15         {
16             for(int s=0;s<=9;s++)/** i -1 **/
17                 if(j!=4 && !(j==6&&s==2))
18                 dp[i][j] = dp[i][j] +dp[i-1][s];
19         }
20     }
21 }
22 int solve(int k)
23 {
24         hlen = 0;
25         while(k)
26         {
27             hxl[++hlen] = k%10;
28             k = k/10;
29         }
30         int sum = 1;
31         for(int i=hlen;i>=1;i--)
32         {
33             for(int j=0;j<hxl[i];j++)
34                 if(j!=4 && !(i+1<=hlen&&j==2&&hxl[i+1]==6))
35                 sum = sum+dp[i][j];
36             if(hxl[i]==4 || (i+1<=hlen&&hxl[i]==2 && hxl[i+1]==6)){
37                     sum --;
38                     break;
39             }
40         }
41         return sum;
42 }
43 int main()
44 {
45     int n,m;
46     init();
47 
48     while(scanf("%d%d",&n,&m)>0)
49     {
50         if(n==0&&m==0)break;
51         printf("%d\n",solve(m)-solve(n-1));
52     }
53     return 0;
54 }