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#include<bits/stdc++.h>
#define ll long long
#define fi first
#define sc second
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n, m, v[1100], t[1100];
vector<int>ans;
int dp[1100][1100];
int main()
{
f>>n>>m;
for(int i=1; i<=n; i++)
f>>v[i];
for(int i=1; i<=m; i++)
f>>t[i];
for(int i=1; i<=n; i++)
for(int j=1; j<=m; j++)
{
if(v[i]==t[j])
dp[i][j]=1+dp[i-1][j-1];
else
dp[i][j]=max(dp[i][j-1], dp[i-1][j]);
}
int i=n, j=m;
g<<dp[n][m]<<'\n';
while(i)
{
if(v[i]==t[j])
{
ans.push_back(v[i]);
i--;
j--;
}
else
{
if(dp[i-1][j]<dp[i][j-1])
j--;
else
i--;
}
}
for(int i=0; i<ans.size(); i++)
g<<ans[i]<<' ';
return 0;
}