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

public class Main {
    public static void main(String[] args) {
		System.out.println(getsequencenumber("BlahBdds seq 1910428391283 ldskgj"));
	}
	
	public static long getsequencenumber(String Packet){
	    Pattern P = Pattern.compile("seq.(\\d*)"); 
	    Matcher m = P.matcher(Packet);
	    if(m.find()){
	        return Long.valueOf(m.group(1));
	    }
	    return -1;
	}
}