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#include <fstream>
#include <algorithm>
using namespace std;
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
int cpy[1026],n,m,i,v1[1026],v2[1026];
int dp[1026][1026];
int main()
{
cin>>n>>m;
for(i=1;i<=n;i++)
cin>>v1[i];
for(i=1;i<=m;i++)
cin>>v2[i];
for(i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if(v1[i]!=v2[j])
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
else
dp[i][j]=max(dp[i-1][j],max(dp[i][j-1],dp[i-1][j-1]+1));
}
}
cout<<dp[n][m]<<'\n';
int counter = dp[n][m];
int x=n,y=m;
while(x>=1&&y>=1)
{
if(v1[x]==v2[y])
cpy[counter--]=v1[x],x--,y--;
else
{
if(dp[x-1][y]>=dp[x][y-1])
x--;
else
y--;
}
}
for(i=1;i<=dp[n][m];i++)
cout<<cpy[i]<<" ";
return 0;
}