1 #include <cstdio>
 2 #include <bitset>
 3 
 4 std::bitset<100005> S;
 5 
 6 signed main(void)
 7 {
 8     int n, m;
 9     
10     while (scanf("%d", &n) != EOF)
11     {
12         S.reset(), S.set(50000);
13         
14         int ans = 0, sum = 0;
15         
16         while (n--)
17             scanf("%d", &m), sum += m,
18             S = (S << m) | (S >> m) | S;
19             
20         S >>= 50000;
21         
22         for (int i = 1; i <= sum; ++i)
23             if (!S[i])++ans;
24         
25         printf("%d\n", ans);
26         
27         if (ans)
28         {
29             bool flag = false;
30             
31             for (int i = 1; i <= sum; ++i)
32                 if (!S[i])
33                 {
34                     if (flag)
35                         printf(" %d", i);
36                     else
37                         printf("%d", i), flag = true;
38                 }
39             
40             puts("");
41         }
42     }
43 }