vector<int> m(26, 0);
    char s[1000000];
    cin.getline(s, 1000000);
    int l = 0;
    string temp = "";
    while (s[l] != '\0') {
        if (s[l] == ' ') {
            m[temp[0] - 'A']++;
            m[temp[temp.size() - 1] - 'A']++;
            temp = "";
        }
        else
            temp += s[l];
        l++;
    }
    m[temp[0] - 'A']++;
    m[temp[temp.size() - 1] - 'A']++;
    for (int i = 0; i < 26; i++) {    
        if (m[i] % 2 != 0) {
            cout << "false" << endl;
            system("pause");
            return 0;
        }
    }
    cout << "true" << endl;
    system("pause");
    return 0;
}