#include <bits/stdc++.h>
const double pi = 3.1415926535897932384626433832795;
int gcd(int a, int b) {
  if (a == 0) return b;
  return gcd(b % a, a);
}
using namespace std;
void ifd() {}
void tme() {}
int main() {
  ifd();
  string s, t, tmp;
  getline(cin, s);
  vector<string> d;
  vector<int> check;
  vector<int> r;
  stringstream p;
  p.clear();
  p << s;
  while (p >> t) d.push_back(t);
  bool f = true;
  for (int i = (0); i < (d.size()); ++i) {
    tmp = d[i];
    while (tmp.size() < 6) tmp = '?' + tmp;
    tmp = tmp.substr(tmp.size() - 6, 6);
    if (tmp[2] == 'l' && tmp[3] == 'i' && tmp[4] == 'o' && tmp[5] == 's') {
      check.push_back(1);
      r.push_back(0);
    } else if (tmp[2] == 'e' && tmp[3] == 't' && tmp[4] == 'r' &&
               tmp[5] == 'a') {
      check.push_back(2);
      r.push_back(1);
    } else if (tmp[3] == 'e' && tmp[4] == 't' && tmp[5] == 'r') {
      check.push_back(2);
      r.push_back(0);
    } else if (tmp[1] == 'l' && tmp[2] == 'i' && tmp[3] == 'a' &&
               tmp[4] == 'l' && tmp[5] == 'a') {
      check.push_back(1);
      r.push_back(1);
    } else if (tmp == "initis") {
      check.push_back(3);
      r.push_back(0);
    } else if (tmp == "inites") {
      check.push_back(3);
      r.push_back(1);
    } else {
      cout << "NO" << endl;
      return 0;
    }
  }
  int te = r[0];
  for (int i = (0); i < (r.size()); ++i)
    if (r[i] != te) f = false;
  if (!f) {
    cout << "NO" << endl;
    return 0;
  }
  if (check.size() == 1) {
    cout << "YES" << endl;
    return 0;
  }
  int n1 = 0, n2 = 0, n3 = 0;
  for (int i = (0); i < (check.size()); ++i) {
    if (check[i] == 1) n1++;
    if (check[i] == 2) n2++;
    if (check[i] == 3) n3++;
    if (i > 0 && check[i] < check[i - 1]) {
      cout << "NO" << endl;
      return 0;
    }
  }
  if (n1 >= 0 && n2 == 1 && n3 >= 0)
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
  tme();
  return 0;
}
