import java.util.Scanner;
class Main {
    public static void main(String[] args) {
      Scanner scanner=new Scanner(System.in);
      while(2>1)
    {int totalLength;
        int numberN=scanner.nextInt();
     int numberM=scanner.nextInt();
     if(numberN==0&&numberM==0)System.exit(0);
     if(numberN==0||numberM==0)totalLength=numberN>numberM?numberN:numberM;
     else totalLength=numberN*numberM;
     int[]input=new int[totalLength];
     int[]temp=new int[totalLength];
     int[]counter=new int[totalLength];
     int count=0;
     for(int i=0;i<totalLength;i++)input[i]=scanner.nextInt();
     java.util.Arrays.sort(input);
      for(int j=0;j<totalLength;j++)
     { temp[count]=input[j];
         for(int k=j+1;k<totalLength;k++)
        {if(temp[count]==input[k]){counter[count]++;j++;}}
         count++;
     }
    int first=0,second=0;
    for(int h=0;h<count;h++)
        if(counter[h]>first)
        {second=first;
        first=counter[h];}
    if(first!=0){
     for(int g=0;g<count;g++)
         if(counter[g]==second)System.out.print(temp[g]+" ");System.out.println();}
      }
}
}