import java.util.*;
public class Main {
    public static void main(String[] args) {

    }

    public String foo(List<String> object) {
        System.out.println(object.get(0));
        return null;
    }

    public List<String> foo(List<List<String>> object) {
        System.out.println(object.get(0).get(0));
        return null;
    }
}