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#include <bits/stdc++.h>
using namespace std;
ifstream fin("scmax.in"); ofstream fout("scmax.out");
int n, len[100010], z, l;
void bs(int n, int l, int r){
int m=l+r; m/=2;
if(len[m-1]<n && len[m]>=n){len[m]=n;}
else{
if(n>len[m]){bs(n, m+1, r);}
else{bs(n, l, m-1);}
}
}
int main() {
fin>>n;
len[0]=0;
l=0;
for(int i=0; i<n; i++){
fin>>z;
if(z>len[l]){len[l+1]=z; l++;}
else{bs(n, 1, l);}
}
fout<<l<<"\n";
for(int i=1; i<=l; i++){
fout<<len[i]<<" ";
}
return 0;
}