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Cod sursa(job #209201)
#include<cstdio>
#define max(a,b) ((a)>(b)?(a):(b))
int n,m,a[1030],b[1030],x[1030][1030],y[1030],k;
void rd()
{
scanf("%d%d",&n,&m);
int i;
for(i=1;i<=n;i++)
scanf("%d",&a[i]);
for(i=1;i<=m;i++)
scanf("%d",&b[i]);
}
void pd()
{
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
a[i][j]=max(max(a[i][j-1],a[i-1][j]),a[i-1][j-1]+(x[i]==y[j]?1:0));
}
void save(int x)
{
y[++k]=x;
}
void af()
{
printf("%d\n",a[n][m]);
int i=n,j=m;
while(a[i][j]!=0)
{
if(a[i-1][j-1]==a[i][j]) i--,j--;
else if(a[i][j-1]==a[i][j]) j--;
else if(a[i-1][j]==a[i][j]) i--;
else save(x[i]),i--,j--;
}
for(int l=a[n][m];l;l--)
printf("%d ",y[l]);
}
int main()
{
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
rd();
pd();
af();
return 0;
}