Vuodet

#include <bits/stdc++.h>
using namespace std;
bool f(int y) {
    auto a = to_string(y);
    auto b = to_string(y * 1337);
    int i = 0;
    for (char c : b) {
        if (a[i] == c) i++;
        if (i == 4) break;
    }
    return i == 4;
}
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    int a, b;
    cin >> a >> b;
    vector<int> res;
    for (int i = a; i <= b; ++i) {
        if (f(i)) res.push_back(i);
    }
    cout << res.size() << endl;
    for (int i : res) cout << i << "\n";
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED