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#include <bits/stdc++.h>
#define MAXN 1000
#define MAXV 50010
using namespace std;
ifstream fin("economie.in");
ofstream fout("economie.out");
void read(int& n, int arr[]) {
fin >> n;
for (int i = 0; i < n; i++)
fin >> arr[i];
}
bool verify(int n, const int arr[], bitset<MAXV>& dp) {
for (int i = 0; i < n; i++)
if (dp[arr[i]] == 0)
return false;
return true;
}
int main() {
int n, arr[MAXN], i;
bitset<MAXV> dp;
read(n, arr);
for (i = 0; i < n && !verify(n, arr, dp); i++) {
for (int j = 1; j < MAXV; j++)
if (j % arr[i] == 0 || dp[j - arr[i]] == 1)
dp[j] = true;
}
fout << i << '\n';
for (--i; i >= 0; i--)
fout << arr[i] << '\n';
return 0;
}