#include <bits/stdc++.h>

using namespace std;
const int N = 32;

int a[N], al;
int f[N][10];

int dfs(int u, int st, bool op) {
    if (u == 0) return 1;
    if (!op && ~f[u][st]) return f[u][st];
    int up = op ? a[u] : 9;
    int ans = 0;
    for (int i = 0; i <= up; i++) {
        if (st == 6 && i == 2) continue;
        if (i == 4) continue;
        ans += dfs(u - 1, i, op && i == a[u]);
    }

    if (!op) f[u][st] = ans;
    return ans;
}

int calc(int x) {
    al = 0;
    while (x) a[++al] = x % 10, x /= 10;
    return dfs(al, -1, true);
}
int main() {
    memset(f, -1, sizeof f);
    int l, r;
    while (~scanf("%d%d", &l, &r) && l + r)
        printf("%d\n", calc(r) - calc(l - 1));
    return 0;
}