# include<stdio.h>
int n,q,m,a,f[999],s;
int main()
{
    while (scanf("%d%d",&n,&q),n!=0)
    {
          for (s=800;s>0;s--) f[s]=0;
          while (n--)
          {
                scanf("%d",&m);
                while (m--)
                {
                      scanf("%d",&a);
                      f[a]++;
                }
          }
          for (m=0;m<800;m++) if (f[m]>=q&&f[m]>f[s]) s=m;
          printf("%d\n",s); 
    }
}

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