/* package whatever; // don't place package name! */
 
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main(String[] args) {
      char[] arr=getDigits(new char[]{'1','R','Y','O','2','3','3' });
      for(int i=0;i<arr.length;i++){
          System.out.print(arr[i]);
      }
    }
 
    public static char[] getDigits(char[] charArray) {
        Pattern p = Pattern.compile("-?\\d+");
        Matcher m = p.matcher(String.valueOf(charArray));
        String str=new String();
        while (m.find()) {
           str=str+m.group();
        }
        return str.toCharArray();
    }
}

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