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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,k,a[1030],b[1030],rez[1030],dp[1030][1030];
///dp[i][j]=lg subsir comun din primele i el din a si primele j el din b
int main()
{
f>>n>>m;
for(int i=1;i<=n;i++)
f>>a[i];
for(int i=1;i<=m;i++)
f>>b[i];
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if(a[i]==b[j])
dp[i][j]=dp[i-1][j-1]+1;
else
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
}
int i=n,j=m;
while(i>=1 and j>=1)
{
if(a[i]==b[j])
{
rez[++k]=a[i];
i--;
j--;
}
else if(dp[i-1][j]<dp[i][j-1])
j--;
else
i--;
}
g<<k<<'\n';
for(int i=k;i>=1;i--)
g<<rez[i]<<" ";
return 0;
}