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#include<stdio.h>
int a[1050][1050],x[1050],y[1060],sol[1050],n,m,i,j,p,nr;
int max(int a, int b)
{
if(a>b)
return a;
return b;
}
int main()
{
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
scanf("%d%d",&n,&m);
for(i=1;i<=n;i++)
scanf("%d",&x[i]);
for(i=1;i<=m;i++)
scanf("%d",&y[i]);
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(x[i]==y[j])
{
a[i][j]=a[i-1][j-1]+1;
}
else
a[i][j]=max(a[i-1][j],a[i][j-1]);
}
printf("%d\n",a[n][m]);
nr=a[n][m];
while(nr)
{
if(x[n]==y[m])
{
p++;
sol[p]=x[n];
n--;
m--;nr--;
}
else
{
if(a[n][m]==a[n-1][m])
n--;
else m--;
}
}
for(i=p;i>=1;i--)
printf("%d ",sol[i]);
return 0;
}