#include <bits/stdc++.h> using namespace std; /* ---===ASCII help===--- '0' -> 48 '9' -> 57 'A' -> 65 'Z' -> 90 'a' -> 97 'z' -> 122 */ const long long mod = 1e9 + 7; void solve() { long long a, b, ans = 0; cin >> a >> b; for (int i = a; i <= b; i++) { string s = to_string(i); set<char> st; for (char c : s) st.insert(c); if (st.size() == s.size()) ans++; } cout << ans << "\n"; } int main() { int t = 1; //cin >> t; while (t--) { solve(); } }