1 #include <bits/stdc++.h> 2 using namespace std; 3 #define fr first 4 #define sc second 5 #define cl clear 6 #define BUG puts("here!!!") 7 #define W(a) while(a--) 8 #define pb(a) push_back(a) 9 #define Rint(a) scanf("%d", &a)10 #define Rll(a) scanf("%I64d", &a)11 #define Rs(a) scanf("%s", a)12 #define Cin(a) cin >> a13 #define FRead() freopen("in", "r", stdin)14 #define FWrite() freopen("out", "w", stdout)15 #define Rep(i, len) for(int i = 0; i < (len); i++)16 #define For(i, a, len) for(int i = (a); i < (len); i++)17 #define Cls(a) memset((a), 0, sizeof(a))18 #define Clr(a, x) memset((a), (x), sizeof(a))19 #define Full(a) memset((a), 0x7f7f7f, sizeof(a))20 #define lrt rt << 121 #define rrt rt << 1 | 122 #define pi 3.1415926535923 #define RT return24 #define lowbit(x) x & (-x)25 #define onecnt(x) __builtin_popcount(x)26 typedef long long LL;27 typedef long double LD;28 typedef unsigned long long ULL;29 typedef pair<int, int> pii;30 typedef pair<string, int> psi;31 typedef pair<LL, LL> pll;32 typedef map<string, int> msi;33 typedef vector<int> vi;34 typedef vector<LL> vl;35 typedef vector<vl> vvl;36 typedef vector<bool> vb;37 38 const int maxn = 25;39 40 LL digit[maxn];41 LL dp[maxn][2];42 43 LL dfs(int l, bool num, bool jud) {44   if(l == 0) return dp[l][num] = 1;45   if(!jud && ~dp[l][num]) return dp[l][num];46   LL ret = 0;47   int nex = jud ? digit[l] : 9;48   Rep(i, nex+1) {49     if((num && i == 2) || i == 4) continue;50     ret += dfs(l-1, i==6, jud&&i==nex);51   }52   if(!jud) dp[l][num] = ret;53   return ret;54 }55 56 LL f(LL num) {57   int pos = 0;58   while(num) {59     digit[++pos] = num % 10;60     num /= 10;61   }62   return dfs(pos, false, true);63 }64 65 LL l, r;66 67 signed main() {68   //FRead();69   Clr(dp, -1);70   while(cin >> l >> r && l + r) {71     cout << f(r) - f(l-1) << endl;72   }73   RT 0;74 }