UVa 12243 Flowers Flourish from France

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

int main() {
    string line;
    char cs, cc;
    bool flag;
    while(true) {
        getline(cin, line);
        if(line[0] == '*') break;
        flag = true;
        (line[0] > 64 && line[0] < 91) ? cc = line[0], cs = cc + 32 : cs = line[0], cc = cs - 32;
        for(int i = 0; line[i]; i++)
            if(line[i] == ' ')
                if(line[i + 1] != cs && line[i + 1] != cc) {
                    flag = false;
                    break;
                }
        flag ? cout << "Y" << endl : cout << "N" << endl;
    }
    return 0;
}