#include <cstdio>

using namespace std;

int v[100001];

int main()
{
    FILE *fin = fopen("scmax.in", "r");
    FILE *fout = fopen("scmax.out", "w");

    int n, x;

    fscanf(fin, "%d", &n);
    for(int i=1; i<=n; ++i){
        fscanf(fin, "%d", &x);
        if(v[0] == 0 || v[v[0]] < x)
            v[++v[0]] = x;
        else if(v[v[0]] > x && v[v[0] - 1] < x)
            v[v[0]] = x;
    }

    fprintf(fout, "%d\n", v[0]);
    for(int i=1; i<=v[0]; ++i)
        fprintf(fout, "%d ", v[i]);

    return 0;
}