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#include <bits/stdc++.h>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int m, n, v[1050], b[1050], mat[1050][1050], sol[1050];
int main(){
in>>n>>m;
for(int i=1;i<=n;i++)
in>>v[i];
for(int i=1;i<=m;i++)
in>>b[i];
for(int i = 1;i<=n;i++){
for(int j=1;j<=m;j++)
{
if(v[i] == b[j]){
mat[i][j] = mat[i-1][j-1] + 1;
}
else{
mat[i][j] = max(mat[i-1][j], mat[i][j-1]);
}
}
}
out<<mat[n][m]<<endl;
int k = 0;
for(int i=n;i>=1;i--)
{
for(int j=m;j>=1;j--){
if(mat[i-1][j-1] + 1 == mat[i][j] && i > 1 && j > 1){
k++;
sol[k] = v[i];
i--;
j--;
}
}
}
for(int i=k;i>=1;i--)
out<<sol[i]<<" ";
}