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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n, m, dp[1025][1025], a[1025], b[1025];
int main(){
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>a[i];
for(int i=1;i<=m;i++)
fin>>b[i];
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
dp[i][j]=max(dp[i-1][j], dp[i][j-1]);
if(a[i]==b[j])
dp[i][j]=max(dp[i][j], dp[i-1][j-1]+1);
//cout<<dp[i][j]<<' ';
}
//cout<<endl;
}
fout<<dp[n][m]<<'\n';
int l=dp[n][m], i=n, j=m;
int ans[l];
while(l){
int ok=1;
while(ok){
ok=0;
if(dp[i-1][j]==dp[i][j]){
i--;
ok=1;
}
if(dp[i][j-1]==dp[i][j]){
j--;
ok=1;
}
}
ans[l]=a[i];
i--;
j--;
//cout<<i<<' '<<j<<' '<<a[i]<<endl;
l--;
}
for(int i=1;i<=dp[n][m];i++)
fout<<ans[i]<<' ';
return 0;
}