感觉想法没问题，但是输出不会解决

#include<bits/stdc++.h>

using namespace std;

const int N = 110;
string num_str[10] = { "XXXX.XX.XX.XXXX","..X..X..X..X..X","XXX..XXXXX..XXX","XXX..XXXX..XXXX","X.XX.XXXX..X..X","XXXX..XXX..XXXX","XXXX..XXXX.XXXX","XXX..X..X..X..X","XXXX.XXXXX.XXXX","XXXX.XXXX..XXXX" };
string a;

int main()
{
	int n;
	cin >> n;
	cin >> a;
	for (int i = 0; i < n-1; i++)
	{
		for (int j = 0; j < 15; j++)
		{
			if (j == 3 || j == 6 || j == 9 || j == 12) cout << endl;
			cout << num_str[a[i] -'0'][j];
		}
		cout << "." << endl;
		cout << "." << endl;
		cout << "." << endl;
		cout << "." << endl;
		cout << "." << endl;
	
	}
	for (int j = 0; j < 15; j++)
	{
		if (j == 3 || j == 6 || j == 9 || j == 12) cout << endl;
		cout << num_str[a[n-1]-'0'][j];
	}
	system("pause");
	return 0;
}