#include <iostream>

using namespace std;

vector <vector <int> > a;

int main() {

    cin >> n;

    for (int i = 1; i <= n; i++) {
        cin >> s[i];
    }

    for (int i = n - 1; i >= 1; i--) {
        int pos = -1;
        for(int j = 0; j < (int)s[i].size(); j++){
            if(s[i][j] < s[i+1][j]){
                break;
            }
            if(s[i][j] > s[i+1][j]){
                pos = j;
                break;
            }
            if(j == (int)s[i + 1].size()) {
                pos = j;
                break;
            }
        }
        if(pos != -1)
            s[i].resize(pos);
    }

    return 0;

}