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Cod sursa(job #499082)
#include<stdio.h>
int a[10001];
int b[10001];
int c[10001];
int main()
{
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
int n,m,i,k,j;
scanf("%d%d",&n,&m);
k=0;
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;i++)
if(a[i]==b[j])
c[++k]=a[i];
printf("%d\n",k);
for(i=1;i<=k;i++)
printf("%d ",c[i]);
return 0;
}