import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class test {
	public static void main(String[] args) {
		String a = "a1234";
		Pattern p = Pattern.compile("/^S[0-9]{4}$/");
		Matcher m=p.matcher(a); 
		boolean b=m.matches();
		System.out.println(b);
	}
}