#include<bits/stdc++.h>
using namespace std;
const int maxN = 270 + 5;
const int bsSize = maxN * maxN + 10;
int n;
int a[maxN];
bitset<bsSize> dp[2][maxN];
int main() {
cin >> n;
int sum = 0;
for (int i = 1; i<=n; i++) {
cin >> a[i];
sum+=a[i];
}
for (int i = 1; i <= n + 1; i++) {
dp[0][i].set(0);
}
for (int i = 1; i<=n; i++) {
for (int j = 1; j <= n + 1; j++) {
if (i == j) {
dp[i&1][j] = dp[(i&1) ^ 1][j];
} else {
dp[i&1][j] = dp[(i&1) ^ 1][j] | (dp[(i&1) ^ 1][j] << a[i]);
}
}
for (int j = 1; j<= n + 1; j++) {
dp[(i - 1)&1][j].reset();
}
}
if (dp[n&1][n + 1][sum/2] == 0) {
printf("0\n");
return 0;
}
vector<int> ans;
for (int i = 1; i <= sum; i++) {
bool ok = true;
for (int j = 1; j<= n; j++) {
int totSum = sum - a[j] + i;
if (totSum % 2 == 1) ok = false;
if (dp[n&1][j][totSum/2] == 0) ok = false;
}
if (ok) ans.push_back(i);
}
cout << ans.size() << endl;
for (int i:ans) {
cout << i << " ";
}
cout << endl;
}
