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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,k,i,j,num=0;
int a[1024],b[1024];
int sols[1024];
int dp[1024][1024];
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)
f>>a[i];
for(i=1;i<=m;i++)
f>>b[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++){
dp[i][j] = max(dp[i-1][j],dp[i][j-1]);
if(a[i] == b[j]){
dp[i][j]++;
}
}
g<<dp[n][m]<<'\n';
num = dp[n][m];
for(i=n;i>=1;i--)
for(j=m;j>=1;j--){
if(dp[i][j] == num && a[i] == b[j]){
sols[num] = b[j];
num--;
}
}
for(i=1;i<=dp[n][m];i++)
g<<sols[i]<<' ';
}