P77715: Pangrames

#include <iostream>
#include <vector>
using namespace std;


int main() {
    char c;
    while (cin >> c) {
        if(c != '.') {
            vector<bool> v(26, false);
            if (c >= 'A' && c <= 'Z') v[int(c - 'A')] = true;
            else if (c >= 'a' && c <= 'z') v[int(c - 'a')] = true;
            while (cin >> c && c != '.') {
                if (c >= 'A' && c <= 'Z') v[int(c - 'A')] = true;
                else if (c >= 'a' && c <= 'z') v[int(c - 'a')] = true;
            }
            bool error = false;
            for (int i = 0; i < 26 && not error; ++i) {
                if (not v[i]) error = true;
            }
            if (not error) cout << "SI" << endl;
            else cout << "NO" << endl;
        }
        else cout << "NO" << endl;
    }
}

//JosepRivaille