import java.util.*;
import java.lang.*;
 
class Main
{
    private static String removeComments(String input) {
        return input.replaceAll("'[^']+'", "");
    }
 
    public static void main (String[] args) throws java.lang.Exception
    {
        System.out.println( removeComments("1+4 'sum'").equals("1+4 ") );
        System.out.println( removeComments("this 'is not a comment").equals("this 'is not a comment") );
        System.out.println( removeComments("1+4 'sum' 'unclosed comment").equals("1+4  'unclosed comment") );
	}
}

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