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#include <bits/stdc++.h>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int n,m,dp[1030][1030],a[1030],b[1030],ans[1030],k;
int main()
{
in>>n>>m;
for(int i=1;i<=n;i++) in>>a[i];
for(int i=1;i<=m;i++) in>>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]);
}
out<<dp[n][m]<<'\n';
int l=n,c=m;
while(l>0&&c>0)
{
if(a[l]==b[c])
{
ans[++k]=a[l];
l--;
c--;
}
else
{
if(dp[l-1][c]>dp[l][c-1]) l--;
else c--;
}
}
for(int i=k;i>0;i--) out<<ans[i]<<" ";
return 0;
}