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#include <bits/stdc++.h>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n, v[100005], dp[100005], maxim[100005], lgmax, i, st, dr, poz, mij;
int main()
{
fin>>n;
for (i=1; i<=n; i++) {
fin>>v[i];
}
dp[n]=1;
maxim[1]=v[n];
lgmax=1;
for (i=n-1; i>=1; i--) {
st=1, dr=lgmax;
poz=0;
while (st<=dr) {
mij=(st+dr)/2;
if (v[i]>=maxim[mij]) {
dr=mij-1;
}
else {
st=mij+1;
poz=mij;
}
}
dp[i]=poz+1;
maxim[poz+1]=max(maxim[poz+1], v[i]);
lgmax=max(lgmax, dp[i]);
}
fout<<lgmax<<'\n';
for (i=1; i<=n; i++) {
if (dp[i]==lgmax) {
fout<<v[i]<<' ';
lgmax--;
}
}
return 0;
}