What is output?

public class WordScramble $\{$

public static void wordScramble$($String rem, String scr$)\{$

if $($rem$.$isEmpty$())\{$

System.out.println$($scr $+$ rem$)$;

$\}$

else $\{$

for $($int i $=0$; i $<$ rem.length$()$; $++$i$)\{$

wordScramble$(($rem$.$substring$(0,$ i$)+$ rem.substring$($i $+1,$ rem.length$())),($scr $+$ rem.charAt$($i$)))$;

$\}$

$\}$

$\}$

public static void main$($String args$[])\{$

wordScramble$("123","")$;

$\}$

$\}$