View Code of Problem 52

public class Main{
  
  public static void main(String[] args){
    Scanner in = new Scanner(System.in);
    String str = in.nextLine();
    Stack<Character> stack = new Stack<Character>();
    for(int i = 0;i<str.length();i++){
        stack.push(str.charAt(i));
    }
    
    while(!stack.empty()){
      System.out.print(stack.pop());
    }
    
  }
 
 
 
}
/*
Main.java:4: error: cannot find symbol
    Scanner in = new Scanner(System.in);
    ^
  symbol:   class Scanner
  location: class Main
Main.java:4: error: cannot find symbol
    Scanner in = new Scanner(System.in);
                     ^
  symbol:   class Scanner
  location: class Main
Main.java:6: error: cannot find symbol
    Stack<Character> stack = new Stack<Character>();
    ^
  symbol:   class Stack
  location: class Main
Main.java:6: error: cannot find symbol
    Stack<Character> stack = new Stack<Character>();
                                 ^
  symbol:   class Stack
  location: class Main
4 errors
*/