#include <stdio.h>
#include <iostream>
#include <cstring>
char asd[51], asd2[51];
int main()
{
    freopen("phonebook.in", "r", stdin);
    freopen("phonebook.out", "w", stdout);
    int count;
    std::cin >> count;
    std::cin >> asd;
    for(int i = 0;i < count;++ i)
    {
        std::cin >> asd2;
        if(strcmp(asd, asd2) == 1)
        {
            std::cout << i + 1 << std::endl;
            return 0;
        }
        //std::cout << i << ' ' << strcmp(asd, asd2);
        for(int j = 0;j < 51;++ j)
            asd[j] = asd2[j];
    }

    return 0;
}