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#include <bits/stdc++.h>
using namespace std;
int v[1025],u[1025],sol[1025],DP[1025][1025];
struct Point{
int l,c;
};
int main(){
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
int n,m;
scanf("%d %d",&n,&m);
for(int i=1;i<=n;++i)
scanf("%d",&v[i]);
for(int i=1;i<=m;++i)
scanf("%d",&u[i]);
for(int i=1;i<=n;++i)
for(int j=1;j<=m;++j)
if(v[i]==u[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]);
Point poz={n,m};
int ct=0;
while(poz.l>0&&poz.c>0){
while(poz.c>1&&DP[poz.l][poz.c]==DP[poz.l][poz.c-1])
--poz.c;
while(poz.l>1&&DP[poz.l][poz.c]==DP[poz.l-1][poz.c])
--poz.l;
sol[DP[n][m]-(ct++)]=v[poz.l];
--poz.l;--poz.c;
}
for(int i=1;i<=DP[n][m];++i)
printf("%d ",sol[i]);
return 0;
}