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#include<bits/stdc++.h>
using namespace std;
const int N=1030;
int n, m;
int a[N], b[N], dp[N][N], t[N];
int main(){
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
f>>n>>m;
for(int i=1;i<=n;i++)f>>a[i];
for(int i=1;i<=m;i++)f>>b[i];
for(int i=1;i<=m;i++){
int s=b[i];
for(int j=1;j<=n;j++){
if(a[j]==s)dp[i][j]=dp[i-1][j-1]+1; else dp[i][j]=max(dp[i-1][j], dp[i][j-1]);
}
}
int l=0, i, j;
for(i=n, j=m;i;){
if(a[i]==b[j]) t[++l]=a[i], i--, j--; else{
if(dp[j-1][i]<dp[j][i-1]) i--; else j--;
}
}
g<<dp[m][n]<<endl;
for(i=l;i>=1;i--)g<<t[i]<<' ';
}