1 #include <cstdio>
  2 #include <cstring>
  3 #include <cstdlib>
  4 #include <cmath>
  5 #include <deque>
  6 #include <vector>
  7 #include <queue>
  8 #include <iostream>
  9 #include <algorithm>
 10 #include <map>
 11 #include <set>
 12 #include <ctime>
 13 #include <iomanip>
 14 using namespace std;
 15 typedef long long LL;
 16 typedef double DB;
 17 #define For(i, s, t) for(int i = (s); i <= (t); i++)
 18 #define Ford(i, s, t) for(int i = (s); i >= (t); i--)
 19 #define Rep(i, t) for(int i = (0); i < (t); i++)
 20 #define Repn(i, t) for(int i = ((t)-1); i >= (0); i--)
 21 #define rep(i, x, t) for(int i = (x); i < (t); i++)
 22 #define MIT (2147483647)
 23 #define INF (1000000001)
 24 #define MLL (1000000000000000001LL)
 25 #define sz(x) ((int) (x).size())
 26 #define clr(x, y) memset(x, y, sizeof(x))
 27 #define puf push_front
 28 #define pub push_back
 29 #define pof pop_front
 30 #define pob pop_back
 31 #define ft first
 32 #define sd second
 33 #define mk make_pair
 34 inline void SetIO(string Name)
 35 {
 36     string Input = Name+".in",
 37     Output = Name+".out";
 38     freopen(Input.c_str(), "r", stdin),
 39     freopen(Output.c_str(), "w", stdout);
 40 }
 41 
 42 inline int Getint()
 43 {
 44     int Ret = 0;
 45     char Ch = ' ';
 46     bool Flag = 0;
 47     while(!(Ch >= '0' && Ch <= '9'))
 48     {
 49         if(Ch == '-') Flag ^= 1;
 50         Ch = getchar();
 51     }
 52     while(Ch >= '0' && Ch <= '9')
 53     {
 54         Ret = Ret * 10 + Ch - '0';
 55         Ch = getchar();
 56     }
 57     return Flag ? -Ret : Ret;
 58 }
 59 
 60 const int N = 110, M = 100010;
 61 int n, m, Arr[N];
 62 int Dp[M], G[M];
 63 bool Visit[N];
 64 vector<int> Ans;
 65 
 66 inline void Input() 
 67 {
 68     scanf("%d", &m);
 69     scanf("%d", &n);
 70     For(i, 1, n) scanf("%d", Arr + i);
 71 }
 72 
 73 inline void Search(int x)
 74 {
 75     if(!x) return;
 76     Visit[G[x]] = 1;
 77     Search(x - Arr[G[x]]);
 78 }
 79 
 80 inline void Solve()
 81 {
 82     Dp[0] = 1;
 83     int Max = 0;
 84     For(i, 1, n)
 85     {
 86         Max += Arr[i];
 87         if(Max > m) Max = m;
 88         Ford(j, Max, Arr[i])
 89             if(Dp[j - Arr[i]])
 90             {
 91                 Dp[j] += Dp[j - Arr[i]];
 92                 if(!G[j]) G[j] = i;
 93             }
 94     }
 95     
 96     if(Dp[m] > 1) puts("-1");
 97     else if(!Dp[m]) puts("0");
 98     else
 99     {
100         Search(m);
101         For(i, 1, n)
102             if(!Visit[i]) Ans.pub(i);
103         int Length = sz(Ans);
104         Rep(i, Length - 1) printf("%d ", Ans[i]);
105         printf("%d\n", Ans.back());
106     }
107 }
108 
109 int main()
110 {
111     #ifndef ONLINE_JUDGE 
112     SetIO("C");
113     #endif 
114     Input();
115     Solve();
116     return 0;
117 }

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