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#include <iostream>
#include <fstream>
#include <stack>
#define NMAX 1030
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n, m, v1[NMAX],v2[NMAX],dp[NMAX][NMAX];
stack <int>st;
int main()
{
f>>n>>m;
int i, j;
for(i=1;i<=n;i++)
f>>v1[i];
for(j=1;j<=m;j++)
f>>v2[j];
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
if(v1[i]==v2[j]) dp[i][j]=1+dp[i-1][j-1];
else dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
g<<dp[n][m]<<'\n';
for(i=n,j=m;i>0 && j>0;)
{
if(v1[i]==v2[j]) st.push(v1[i]),--i,--j;
else if(dp[i][j-1]>dp[i-1][j]) --j;
else --i;
}
while(!st.empty())
{
g<<st.top()<<' ';
st.pop();
}
return 0;
}