#include<iostream>

#include<cstdio>

#include<cstring>

#include<queue>

#include<algorithm>

#define il inline

#define Rg register

#define go(i,a,b) for(Rg int i=a;i<=b;++i)

#define yes(i,a,b) for(Rg int i=a;i>=b;--i)

#define e(i,u) for(Rg int i=b[u];i;i=a[i].nt)

#define mem(a,b) memset(a,b,sizeof(a))

#define ll long long

#define ull unsigned long long

#define db double

#define inf 2147483647

using namespace std;

const int N=1000010,mod=1000000007;

il int read()

{

    ll x=0;int y=1;char c=getchar();

    while(c<'0'||c>'9'){if(c=='-')y=-1;c=getchar();}

    while(c>='0'&&c<='9'){x=((x<<1)%mod+(x<<3)%mod+c-'0')%mod;c=getchar();}

    return x*y;

}

int n,m,ct,as[N],a[N];

il bool ck(int x)

{

    ll ret=0;

    yes(i,n,0)ret=(ret*x%mod+a[i])%mod;

    if(ret==0)return 1;return 0;

}

int main()

{

    n=read(),m=read();

    go(i,0,n)a[i]=read();

    go(i,1,m)if(ck(i))as[++ct]=i;

    printf("%d\n",ct);

    go(i,1,ct)printf("%d\n",as[i]);

    return 0;

}