#include <iostream> using namespace std; int main() { int left; int right; cin >> left >> right; const int x = 2; int times = 0; for (int i = left; i <= right; i++) { int copy_i = i; while (copy_i != 0) { int ones_place = copy_i % 10; if (ones_place == x) { times++; } copy_i = copy_i / 10; } } cout << times; return 0; }