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#include <bits/stdc++.h>
using namespace std;
int dp[1026][1026],a[1026],b[1026],c[1026],i,j,n,m,sol,N;
int main()
{
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
scanf("%d%d",&n,&m);
for(i=1;i<=n;i++)
scanf("%d",&a[i]);
for(i=1;i<=m;i++)
scanf("%d",&b[i]);
for(i=1;i<=n;i++)
for(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]);
}
sol=dp[n][m];
N=sol;
printf("%d\n",sol);
for(i=n,j=m;sol;)
{
if(a[i]==b[j])
{
c[sol--]=a[i];
i--;j--;
}
else
{
if(dp[i-1][j]>dp[i][j-1])
i--;
else
j--;
}
}
for(i=1;i<=N;i++)
printf("%d ",c[i]);
return 0;
}