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#include<bits/stdc++.h>
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout("cmlsc.out");
int m,n,v[1001],f[1001],i,j;
long long dp[1001][1001];
int main(){
fin>>m>>n;
for(i=1;i<=m;i++)
fin>>v[i];
for(i=1;i<=n;i++)
fin>>f[i];
for(i=1;i<=m;i++){
for(j=1;j<=n;j++){
if (v[i]==f[j])
dp[i][j]=dp[i-1][j-1]+1;
else
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
}
i=1;
j=1;
fout<<dp[m][n]<<"\n";
while(j<=n && i<=m){
if(v[i]==f[j]){
fout<<v[i]<<" ";
i++;
j++;
}
if(dp[i+1][j]<dp[i][j+1])j++;
else if(dp[i+1][j]>=dp[i][j+1])i++;
}
}