#include<stdio.h>
int xx[10002];
int main()
{
	int n,m,i,j,a,max,dier;
	while(scanf("%d%d",&n,&m)&&(n||m)){
		max=0;dier=0;
		for(i=0;i<10002;i++)xx[i]=0;
		for(i=0;i<n;i++)for(j=0;j<m;j++)
		{
			scanf("%d",&a);xx[a]++;
			if(xx[a]>max){dier=max;max=xx[a];}
		}
		for(i=0;i<10001;i++)if(xx[i]==dier){printf("%d",i);break;}
		for(i++;i<10001;i++)if(xx[i]==dier)printf(" %d",i);
		printf("\n");
	}
	return 0;
}