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#include <cstdio>
#include <algorithm>
using namespace std;
int dp[1030][1030];
int v1[1030];
int v2[1030];
int sol[1030];
int main()
{ freopen("cmlsc.in", "r",stdin);
freopen("cmlsc.out", "w",stdout);
int n,m,i,j,k=0;
scanf("%d%d", &n, &m);
for(i=1; i<=n; i++)
scanf("%d", &v1[i]);
for(i=1; i<=m; i++)
scanf("%d", &v2[i]);
for(i=1; i<=n; i++)
for(j=1; j<=m; j++)
if(v1[i]==v2[j])
dp[i][j]=dp[i-1][j-1]+1;
else
dp[i][j]=max(dp[i-1][j], dp[i][j-1]);
printf("%d\n", dp[n][m]);
i=n;
j=m;
while(i>0 && j>0){
if(v1[i]==v2[j]){
sol[++k]=v1[i];
i--;
j--;
}
else{
if(dp[i-1][j]>dp[i][j-1])
i--;
else
j--;
}
}
reverse(sol+1, sol+dp[n][m]+1);
for(i=1; i<=k; i++)
printf("%d ", sol[i]);
return 0;
}