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#include <bits/stdc++.h>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int dp[1030][1030],a[1030],b[1030],v[1030];
int main()
{
int n,m,k=0;
in>>n>>m;
for(int i=1;i<=n;i++)
in>>a[i];
for(int j=1;j<=m;j++)
in>>b[j];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
int x=0;
if(a[i]==b[j]) {
x++;
v[++k]=a[i];
}
dp[i][j]=max(dp[i-1][j-1]+x,max(dp[i][j-1],dp[i-1][j]));
}
int ct=dp[n][m];
for(int i=n;i>=1&&ct;i--)
for(int j=m;j>=1&&ct;j--)
if(a[i]==b[j])
{
v[++k]=a[i];
ct--;
}
out<<dp[n][m]<<"\n";
for(int i=1;i<=k/2;i++)
out<<v[i]<<" ";
return 0;
}