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Stack.java

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import java.util.*;

class Stack{

public static void main(String []argh)

{

Scanner sc = new Scanner(System.in);

while (sc.hasNext()) {

String input=sc.next();

//Complete the code

while(input.length() != (input = input.replaceAll("\\(\\)|\\[\\]|\\{\\}", "")).length());

System.out.println(input.isEmpty());

}

sc.close();

}