#include <bits/stdc++.h>
#include "testlib.h"
#include <sys/wait.h>
using namespace std;

int main(int argc, char *argv[])
{
  pid_t pid;
  int status;
  if (pid = fork() == 0)
  {
    registerValidation(argc, argv);
    inf.readString("[1-9][0-9]");
    inf.readEof();
    exit(0);
  }
  wait(&status);
  if (WEXITSTATUS(status) == 0)
    cout << "Yes\n";
  else
    cout << "No\n";
}