#include<iostream>
#include<fstream>
#define MAX 50000
using namespace std;
string S[MAX];
int Result(string A[], int n)
{
    for(int i=0;i<n-1;i++)
    {
        for(int k=i;k<n;k++)
        {
            if(A[i]>A[k])
            {
                return i;
            }
        }
    }
}
int main()
{
    ifstream in;
    ofstream out;
    in.open("phonebook.in");
    out.open("phonebook.out");
    int n;
    in>>n;
    for(int i=0;i<n;i++) in>>S[i];
    int result = Result(S,n);
    out<<result+1<<endl;
    return 0;
}