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#include <iostream>
#include <stdio.h>
using namespace std;
int a[1025], b[1025], d[260][260];
int main()
{
freopen("cmlsc.in", "r", stdin);
freopen("cmlsc.out", "w", stdout);
int n, m;
cin>>n>>m;
for(int i=1; i<=n; i++)
scanf("%d ", &a[i]);
for(int i=1; i<=m; i++)
scanf("%d ", &b[i]);
for(int i=1; i<=n; i++)
{
for(int j=1; j<=m; j++)
{
if(a[i]==b[j])
d[i][j]=d[i-1][j-1]+1;
else
d[i][j]=max(d[i-1][j],d[i][j-1]);
}
}
cout<<d[n][m]<<endl;
int i, j, c=d[n][m], r[1025];
i=n;
j=m;
while(i>=1 && j>=1 && c>0)
{
if(a[i]==b[j])
{
r[c--]=a[i];
i--;
j--;
}
else
{
if(d[i-1][j]>d[i][j-1])
i--;
else
j--;
}
}
for(i=1; i<=d[n][m]; i++)
printf("%d ",r[i]);
return 0;
}