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#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
long long n,i,j;
void SCMAX()
{
f>>n;
long long v[n+1];
for(i=1;i<=n;i++)
f>>v[i];
vector<long long> dp(n+1);
vector<long long> s(n+1);
vector<long long> scmax(n+1);
dp[1]=1;
s[1]=0;
for(i=2;i<=n;i++)
{
dp[i]=1;
s[i]=0;
for(j=1;j<i;j++)
{
if(v[j]<v[i])
{
if(dp[j]+1>dp[i])
{
dp[i]=dp[j]+1;
s[i]=j;
}
}
}
}
long long sol=dp[1],pos=1;
for(i=2;i<=n;i++)
{
if(dp[i]>sol)
{
sol=dp[i];
pos=i;
}
}
g<<sol<<'\n';
for(i=1;i<=sol;i++)
{
scmax[i]=v[pos];
pos=s[pos];
}
for(i=sol;i>=1;i--)
g<<scmax[i]<<" ";
}
int main()
{
SCMAX();
return 0;
}