# include <stdio.h>
# include <string.h>

struct{
    char name[50];
    int n,l;
}co[1010];

int main ()
{
    int n,i,j,max,num;
    while(scanf("%d",&n),n)
    {
        getchar();
        for(i=0;i<n;i++)
        {
             gets(co[i].name);
             co[i].l=strlen(co[i].name);
             co[i].n=1;
        }
        max=0;num=0;
        for(i=0;i<n;i++)
        {
            for(j=i+1;j<n;j++)
            {
                if(co[i].l==co[j].l && strcmp(co[i].name,co[j].name)==0)
                    co[i].n++;
            }
            if(max<co[i].n)
            {
                 max=co[i].n;
                 num=i;
            }
        }
        puts(co[num].name);
    }
    return 0;
}