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#include <bits/stdc++.h>
#define Nmax 100001
using namespace std;
ifstream f("scmax.in"); ofstream g("scmax.out");
int n,a[1000007],dp[100007],t[100007];
void afis(int m)
{ if(m)
{ afis(t[m]);
g<<a[m]<<" ";
}
}
int main()
{ f>>n;
for(int i=1;i<=n;i++) f>>a[i];
dp[1]=1;
int k=1;
for(int i=2;i<=n;i++)
{ int st=1,dr=k;
while(st<=dr)
{ int m=(st+dr)/2;
if(a[dp[m]]<a[i]) st=m+1; else dr=m-1;
}
if(st>k) k++;
dp[st]=i; t[i]=dp[st-1];
}
g<<k<<"\n";
afis(dp[k]);
return 0;
}