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#include<bits/stdc++.h>
#include<fstream>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int a[2048], b[2048], glo, res[2048], c;
int bestTill[2048][2048];
vector<int> r;
int main(){
int n, m;
in>>n>>m;
for(int i=0;i<n;++i){
in>>a[i];
}
for(int i=0;i<m;++i)in>>b[i];
for(int i=0;i<n;++i){
for(int j=0;j<m;++j){
if(a[i]==b[j])
if(i>0 && j>0)
glo = max (glo, bestTill[i][j] = 1+bestTill[i-1][j-1]);
else
glo = max(glo, bestTill[i][j]=1);
else bestTill[i][j] = max(bestTill[i-1][j], bestTill[i][j-1]);
}
}
out<<glo<<'\n';
for(int i=n-1, j=m-1; i>=0;){
if(a[i] == b[j] && i>0 && j > 0) res[c++]=a[i], --i, --j;
else if(bestTill[i][j-1] > bestTill[i-1][j] && j > 0) --j;
else -- i;
}
for(int i=glo-1;i>-1; --i)out<<res[i]<<' ';
return 0;
}