A. Pangram

int n ; cin >> n ;
    if (n < 27) cout << "NO" ;
    else {
    string s ; cin >> s ;
        transform(s.begin() , s.end() , s.begin(),::tolower);
        cout << s << "\n" ;
        int freq[n + 1] ;
        for (int i = 0; i < s.size(); i++) freq[s[i] - 'a']++ ;
        bool valid = true ;
        for (int i = 0; i < n + 1; i++)
            if (freq[i] == 0) valid = false ;
        cout << (valid ? "YES" : "NO") ;
    }