Untitled

#include <iostream>
#include <string>
using namespace std;
 
int main()
{
    string str;
    char alphabetSmall[26] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z' };
    char result[26]{};
    int n;
    int flag = 0;
    cin >> n;
    cin >> str;
 
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < 26; j++)
        {
            if (alphabetSmall[j] == str[i] || (alphabetSmall[j] - 32) == str[i])
            {
                result[j] = str[i];
                break;
            }
        }
    }
    for (int i = 0; i < 26; i++)
    {
        if (result[i] == 0)
        {
            cout << "NO" << endl;
            flag = 1;
            break;
        }
    }
    if (flag == 0) cout << "YES" << endl;
}