pattern7.cpp

#include <iostream>
using namespace std;

int main()
{
    int n;
    cin >> n;

    int row = 0;
    while (row < n)
    {
        int col = 1;
        
        while (col <= n)
        {
            char ch = 'A' + col - 1;
            cout << ch;
            col += 1;
        }
        cout << endl;
        row += 1;
    }
}