/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		StringBuilder sb = new StringBuilder ("buffering");
		sb.replace (2, 7, "BUFFER");
		sb.delete(2, 4);
		String s = sb.substring (1, 5);
		System.out.println(s);
	}
}

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