import java.util.*;

public class DocusignServer {
    private ArrayList<String> serverPool;

    public DocusignServer() {
        this.serverPool = new ArrayList<String>();
    }


    public static void main(String[] args) {
        if (args.length < 1) {
            throw new IllegalArgumentException("Too few arguments!");
        }

        DocusignServer tester = new DocusignServer();

        System.out.println(tester.randomServer(args));
    }

    public String randomServer(String[] serverArray) {
        for (int i = 0; i < serverArray.length; i++) {
            String[] serverValue = serverArray[i].split(":");
            String serverName = serverValue[i];
            Integer serverSize = Integer.parseInt(serverValue[1]);
            for (int j = 0; j < serverSize; j++) {
                serverPool.add(serverName);
            }
        }

        Random randomServer = new Random();

        return serverPool.get(randomServer.nextInt(serverPool.size()));
    }
}