public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String input = scanner.nextLine();
        int len = 0, lenMax = 0, index = 0;
        for(int i = 0; i < input.length(); i++) {
            switch(input.charAt(i)) {
                case ' ':
                    len = 0;
                    break;
                default:
                    len++;
                    if(len > lenMax) {
                        lenMax = len;
                        index = i;
                    }
            }
        }
        System.out.println(input.substring(index - lenMax + 1, index + 1));
    }