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//subsir comun maximal al doua siruri
#include <stdio.h>
int a[1026],b[1026],lg[1026][1026],n,m;
void afisare(int i,int j,int pas)
{
if(pas)
{
if(a[i]==b[j])
{
afisare(i-1,j-1,pas-1);
printf("%d ",a[i]);
}
else
if(lg[i][j-1]==pas)
afisare(i,j-1,pas);
else
afisare(i-1,j,pas);
}
}
int main()
{
int i,j;
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
scanf("%d%d",&n,&m);
for(i=1;i<=n;i++)
{
scanf("%d",&a[i]);
}
for(i=1;i<=m;i++)
{
scanf("%d",&b[i]);
}
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]==b[j])
lg[i][j]=1+lg[i-1][j-1];
else
if(lg[i-1][j]>lg[i][j-1])
lg[i][j]=lg[i-1][j];
else
lg[i][j]=lg[i][j-1];
printf("%d\n",lg[n][m]);
afisare(n,m,lg[n][m]);
return 0;
}