/* 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
{
{
String text
= "aaaaa bbbb vvv kk i-u gj- -tu"; System.
out.
println(text.
replaceAll("(?<=\\s|^)[\\w-]{1,3}(?=\\s|$)",
"X")); }
}
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