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import java.util.*;

class VariableSizeStack<T> {

private ArrayList<T> storage = new ArrayList<T>();

public int count() {

return storage.size();

}

public void push(T item) {

storage.add(item);

}

public T pop() {

return storage.remove(storage.size() - 1);

}

}

class GenericCast {

public static void main(String[] args) {

VariableSizeStack<String> strings =

new VariableSizeStack<String>();

for(String s : "A B C D E F G H I J".split(" "))

strings.push(s);

int currentCount = strings.count();

for(int i = 0; i < currentCount; i++) {

String s = strings.pop();

System.out.print(s + " ");

}

}

}