#include <bits/stdc++.h>
#include "books.h"
using namespace std;
//
// --- Sample implementation for the task books ---
//
// To compile this program with the sample grader, place:
// books.h books_sample.cpp sample_grader.cpp
// in a single folder and run:
// g++ books_sample.cpp sample_grader.cpp
// in this folder.
//
void solve(int n, int k, long long a, int s) {
vector<long long> x(n);
for (int i = 0; i < n; i++) x[i] = skim(i + 1);
if (x[1] == 42) {
impossible();
} else {
answer({1, 3});
}
}
