Get numbers from String

/*find numbers from the given string.
for example if string is"face45face56"
the output must be 4556*/
import java.util.Scanner;
class StringFun
{
public static void main(String args[])
{
Scanner sc=new Scanner(System.in);
String s=sc.nextLine();
int i;
String s2="";
char ch;
for(i=0;i<s.length();i++)
{
ch=s.charAt(i);
if(Character.isDigit(ch))
s2=s2+ch;
}
int num=Integer.parseInt(s2);
System.out.println(s2);
//now do anything with num
}
}