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#include <fstream>
using namespace std;
#define NMAX 100000
ifstream cin("scmax.in");
ofstream cout("scmax.out");
int v[NMAX + 1];
int dp[NMAX + 1];
int prv[NMAX + 1];
int sol[NMAX + 1];
int main(){
int poz ,n,i,cnt = 0 ,st,j,cntmax = 0,k = 0;
cin >> n;
for(i = 1; i <= n; i++){
cin >> v[i];
}
for(i = 1; i <= n; i++){
dp[i] = 1;
prv[i] = -1;
for(j = 1; j < i ; j++){
if(v[j] < v[i]){
if(dp[i] < dp[j] + 1){
dp[i] = dp[j] + 1;
prv[i] = j;
}
}
}
if(dp[i] > cntmax){
cntmax = dp[i];
st = i;
}
}
poz = st;
while(poz != -1){
k++;
sol[k] = v[poz];
poz = prv[poz];
}
cout << cntmax << '\n';
for(i = k ; i >= 1; i --)
cout << sol[i] << " ";
return 0;
}