public class Solution {
    public static void main(String[] args) throws Exception {
        //write your code here
        int b = 0, c = 0;
        ArrayList<String> list = new ArrayList<String>();
        Scanner scan = new Scanner(System.in);
        for(int i = 0; i < 10; i++){
            list.add(scan.nextLine());
        }

        int min = list.get(0).length();
        int max = list.get(0).length();
        for(int i = 0; i < 10; i++){
            if(min > list.get(i).length()){
                min = list.get(i).length();
                b = i;
            }
            if(max < list.get(i).length()){
                max = list.get(i).length();
                c = i;
            }
        }
        if(b < 9 - c)
            System.out.println(list.get(b));
        else
            System.out.println(list.get(c));
    }
}