#include<stdio.h>
int main(void)
{
    int y;
    scanf("%d\n",&y);
    char chess[y][10];
    for(int i=0;i<y*10;i++)*(*chess+i)='\0';

    int num,x=0,i=0;
    while((num=getchar())!='\n')
    {
        if(num==' ')i++,x=0;
        else chess[i][x++]=num;
    }
    num=y;
    for(int a=0;a<10;a++)
    {
        int fate=1,n;
        while(fate)
        {
            int i=0;
            for(int b=0;b<y;b++)if(chess[b][a]>i)i=chess[b][a],n=b;
            
            for(int b=0;b<y;b++)
            {
                if(chess[b][a]==i&&b!=n)
                {
                    fate=0;
                    break;
                }}

            if(fate)
            {
                a=0;num--;
                printf("%s",*(chess+n));
                if(!num)return 0;
                for(int a=0;a<10;a++)*(*(chess+n)+a)=0;
}}}}