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#include<stdio.h>
short int v[1025],d,s[1025][1025],i,j,n,m,x[1025],y[1025],k,e;
int main() {
freopen("cmlsc.in","r",stdin),freopen("cmlsc.out","w",stdout),scanf("%hd%hd",&n,&m);
for(i=1;i<=n;i++)
scanf("%hd",&x[i]);
for(i=1;i<=m;i++)
scanf("%hd",&y[i]);
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(x[i]==y[j])
s[i][j]=1+s[i-1][j-1];
else
s[i][j]=s[i-1][j]<s[i][j-1]?s[i][j-1]:s[i-1][j];
k=s[n][m],printf("%hd\n",k);
for(i=n;i;i--)
for(j=m;j;j--)
if(s[i][j]==k)
v[k]=y[j],d=i-1,e=j-1;
for(i=k-1;i;i--) {
for(;s[d-1][e]==i;d--);
for(;s[d][e-1]==i;e--);
v[i]=x[d],d--,e--;
}
for(i=1;i<=k;i++)
printf("%hd ",v[i]);
}