#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx")
template <class T = int>
inline T readInt();
inline double readDouble();
inline int readUInt();
inline int readChar();
inline void readWord(char *s);
inline bool readLine(char *s);
inline bool isEof();
inline int getChar();
inline int peekChar();
inline bool seekEof();
inline void skipBlanks();
inline std::string readString();
template <class T>
inline void writeInt(T x, char end = 0, int len = -1);
inline void writeChar(int x);
inline void writeWord(const char *s);
inline void writeDouble(double x, int len = 0);
inline void flush();
static struct buffer_flusher_t {
  ~buffer_flusher_t() { flush(); }
} buffer_flusher;
using namespace std;
template <typename T>
inline void pv(const std::vector<T> &vector, char separator = ' ',
               char end = '\n') {
  for (int i = 0; i < vector.size(); ++i) {
    if (i != 0) {
      writeChar(separator);
    }
    writeInt(vector[i]);
  }
  writeChar(end);
}
inline void init() {
  srand(time(0));
  ios_base::sync_with_stdio(0);
  cin.tie(0);
}
static const int buf_size = 4 * 4096;
static unsigned char buf[buf_size];
static int buf_len = 0, buf_pos = 0;
inline string readString() {
  const int MAX = 1e6 + 42;
  static char buf[MAX];
  readWord(buf);
  return string(buf);
}
inline bool isEof() {
  if (buf_pos == buf_len) {
    buf_pos = 0, buf_len = fread(buf, 1, buf_size, stdin);
    if (buf_pos == buf_len) return 1;
  }
  return 0;
}
inline int getChar() { return isEof() ? -1 : buf[buf_pos++]; }
inline int peekChar() { return isEof() ? -1 : buf[buf_pos]; }
inline bool seekEof() {
  int c;
  while ((c = peekChar()) != -1 && c <= 32) buf_pos++;
  return c == -1;
}
inline void skipBlanks() {
  while (!isEof() && buf[buf_pos] <= 32U) buf_pos++;
}
inline int readChar() {
  int c = getChar();
  while (c != -1 && c <= 32) c = getChar();
  return c;
}
inline int readUInt() {
  int c = readChar(), x = 0;
  while ('0' <= c && c <= '9') x = x * 10 + c - '0', c = getChar();
  return x;
}
template <class T>
inline T readInt() {
  int second = 1, c = readChar();
  T x = 0;
  if (c == '-')
    second = -1, c = getChar();
  else if (c == '+')
    c = getChar();
  while ('0' <= c && c <= '9') x = x * 10 + c - '0', c = getChar();
  return second == 1 ? x : -x;
}
inline double readDouble() {
  int second = 1, c = readChar();
  double x = 0;
  if (c == '-') second = -1, c = getChar();
  while ('0' <= c && c <= '9') x = x * 10 + c - '0', c = getChar();
  if (c == '.') {
    c = getChar();
    double coef = 1;
    while ('0' <= c && c <= '9') x += (c - '0') * (coef *= 1e-1), c = getChar();
  }
  return second == 1 ? x : -x;
}
inline void readWord(char *second) {
  int c = readChar();
  while (c > 32) *second++ = c, c = getChar();
  *second = 0;
}
inline bool readLine(char *second) {
  int c = getChar();
  while (c != '\n' && c != -1) *second++ = c, c = getChar();
  *second = 0;
  return c != -1;
}
static int write_buf_pos = 0;
static char write_buf[buf_size];
inline void writeChar(int x) {
  if (write_buf_pos == buf_size)
    fwrite(write_buf, 1, buf_size, stdout), write_buf_pos = 0;
  write_buf[write_buf_pos++] = x;
}
inline void flush() {
  if (write_buf_pos)
    fwrite(write_buf, 1, write_buf_pos, stdout), write_buf_pos = 0;
}
template <class T>
inline void writeInt(T x, char end, int output_len) {
  if (x < 0) writeChar('-'), x = -x;
  char second[24];
  int n = 0;
  while (x || !n) second[n++] = '0' + x % 10, x /= 10;
  while (n < output_len) second[n++] = '0';
  while (n--) writeChar(second[n]);
  if (end) writeChar(end);
}
inline void writeWord(const char *second) {
  while (*second) writeChar(*second++);
}
inline void writeDouble(double x, int output_len) {
  if (x < 0) writeChar('-'), x = -x;
  int t = (int)x;
  writeInt(t), x -= t;
  writeChar('.');
  for (int i = output_len - 1; i > 0; i--) {
    x *= 10;
    t = std::min(9, (int)x);
    writeChar('0' + t), x -= t;
  }
  x *= 10;
  t = std::min(9, (int)(x + 0.5));
  writeChar('0' + t);
}
const int MAXN = 3e5 + 42;
const int MOD = 1e9 + 7;
void solve() {
  int n = readInt();
  vector<pair<char, int>> oper;
  vector<int> pos;
  for (int i = 0; i < 2 * n; ++i) {
    char c = readChar();
    if (false) cerr << "c = " << c << endl;
    if (c == '+') {
      oper.push_back({'+', 0});
      pos.push_back(oper.size() - 1);
      continue;
    } else {
      int cost = readInt();
      oper.push_back({'-', cost});
      if (pos.empty()) {
        writeWord("NO\n");
        return;
      }
      int x = pos.back();
      if (false) cerr << x << endl;
      pos.pop_back();
      oper[x].second = cost;
    }
  }
  set<int> have;
  vector<int> ans;
  for (auto [op, c] : oper) {
    if (false) cerr << op << ' ' << c << endl;
    if (op == '+') {
      have.insert(c);
      ans.push_back(c);
    } else {
      auto u = *have.begin();
      if (u != c) {
        writeWord("NO\n");
        return;
      }
      have.erase(have.begin());
    }
  }
  writeWord("YES\n");
  pv(ans);
}
signed main() {
  init();
  init();
  solve();
}
