#include <fstream>

using namespace std;

ifstream f("date.in");
ofstream g("date.out");
int v[100],m,maxi,k,aux,n,c[100];

int main()
{
    f>>n;
    m=1;
    for(int i=1;i<=n;i++)
        f>>v[i];
    for(int i=1;i<=n;i++)
    {
        if(v[i]<=v[i+1])
        {
            k++;
            m=m*10+i;
            c[k]=v[i];
            if(k>maxi)maxi=k;
        }
        else if(v[i]>v[i+1]) k=0;
    }
    m=m%10;
    c[maxi+1]=v[m+1];
    for(int i=1;i<maxi+1;i++)
        for(int j=i+1;j<=maxi+1;j++)
        if(c[i]>c[j])
    {
        aux=c[i];
        c[i]=c[j];
        c[j]=aux;
    }
    for(int i=1;i<maxi+1;i++)
    {
        if(c[i-1]==c[i])
            c[i]=c[i+1];
    }
    maxi--;
    g<<maxi+1<<"\n";
    for(int i=1;i<=maxi+1;i++)
        g<<c[i]<<" ";

    return 0;
}