Vuodet

#include <bits/stdc++.h>

#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()

using namespace std;
using ll = long long;

const int inf = 1e9;
const ll LLinf = 1e18;
constexpr int leet = 1337;

bool ok(int x) {
    int y = x * leet;

    while (y > 0) {
        if (y % 10 == x % 10) {
            x /= 10;
        }
        y /= 10;
    }

    return x == 0;
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
    int a, b;
    cin >> a >> b;
    vector<int> ans;
    for (int i = a; i <= b; ++i) {
        if (ok(i)) ans.push_back(i);
    }

    cout << sz(ans) << "\n";
    for (int x : ans ) cout << x << "\n";
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED