学步园

#include<cstdio>
#include<cstring>
#include<cstdlib>
char ch[20];
int j[1000010];
void set()
{
    int i;
    j[0]=0;
    for(i=1;i<=1000010;i++)
        {   j[i]=j[i-1];
            itoa(i,ch,10);
            if((strstr(ch,"62")!=NULL)||(strstr(ch,"4")!=NULL))
            continue;
            else j[i]++;
        }
}
int main()
{
    int a,b;
    set();
    while(scanf("%d%d",&a,&b)!=EOF)
    {
        int k=0;
        if(a==0&&b==0) break;
        printf("%d\n",j[b]-j[a-1]);
    }
    return 0;
}