#include <bits/stdc++.h> using namespace std; bool flag[10001]; int main(){ int n, m; cin >> n >> m; for(int i = n; i <= m; i++){ int k = i; flag[i] = true; while(k){ int x = k % 10; if(x % 2 != 1){ flag[i] = false; break; } k /= 10; } } int cnt = 0; for(int i = n; i <= m; i++){ if(flag[i] == true){ cnt++; } } cout << cnt; return 0; }