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Cod sursa(job #499804)
#include<fstream.h>
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int main()
{
int f[257]={0};
int n,m,i;
short x;
fin>>m>>n;
for(i=1;i<=m;i++) {fin>>x;
f[x]++;}
m=0;
for(i=1;i<=n;i++) {fin>>x;
f[x]++;
if(f[x]==2) m++; }
fout<<m<<'\n';
for(i=0;i<=256;i++) if (f[i]==2) fout<<i<<" ";
fin.close();
fout.close();
return 0;
}