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import java.util.ArrayDeque;

import java.util.Deque;

public class Program101 {

// Using Deque to implement a stack

public static void main(String[] args) {

Deque<Integer> stack = new ArrayDeque<>();

stack.push(100);

stack.push(200);

System.out.println(stack.pop()); // 200

System.out.println(stack.peek()); // 100

}

}