#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
int main(void)
{
    int people;
    int villger[150]={0};
    char greeting[50]="";
    scanf("%d",&people);
    for(int i=0;i<people;i++)
    {
        for(int j=0;j<people;j++)
        {
            if(i==j)
            {
                continue;
            }
            scanf("%s",greeting);
            if(strcmp(greeting,"nyanpass")==0)
            {
                villger[j]++;
            }
        }
    }
    int nyanpass=-1;
    int maxgreetcnt=-1;
    for(int i=0;i<people;i++)
    {
        if(villger[i]!=0)
        {        
            if(maxgreetcnt<villger[i])
            {
                maxgreetcnt=villger[i];
                nyanpass=i+1;
            }
            else if(maxgreetcnt==villger[i])
            {
                nyanpass=-1;
            }
        }
    }
    printf("%d",nyanpass);
}