#include<cstdio>
using namespace std;
int a,b,c,x[500001],i;
int s[1000001],count;
int main()
{
scanf("%d%d%d",&a,&b,&c);
for(i=0;i<a;i++)
{
scanf("%d",&x[i]);
s[x[i]]++;
}
for(i=0;i<b;i++)
{
scanf("%d",&x[i]);
s[x[i]]++;
}
for(i=0;i<c;i++)
{
scanf("%d",&x[i]);
s[x[i]]++;
}
for(i=0;i<1000000;i++)
{
if(s[i]>1)
count++;
}
printf("%d\n",count);
for(i=0;i<1000000;i++)
{
if(s[i]>1)
printf("%d\n",i);
}
return 0;
}
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