// kodkupa 2 feladat.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <string>

using namespace std;

string s;
int n, i, x[1000],j,db;
bool t;

int main()
{
    cin >> n;
    db = 0;
    j = 1;
    getline(cin, s);
    while(j<=n)
    {
        t = false;
        getline(cin, s);
        if (!s.empty())
        {
            for (i = 0; i < s.size(); ++i)
            {
                if (s[i] >= 65 && s[i] <= 90)
                {
                    x[s[i] + 32]++;
                }
                else x[s[i]]++;
            }
            for (i = 97; i <= 122; ++i)
            {
                if (x[i] > 2)
                {
                    t = true;
                    x[i] = 0;
                }
                else x[i] = 0;
            }
            if (t == false) db++;
            j++;
        }
        
    }
    cout << db;
    return 0;
}

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

// Tips for Getting Started: 
//   1. Use the Solution Explorer window to add/manage files
//   2. Use the Team Explorer window to connect to source control
//   3. Use the Output window to see build output and other messages
//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file