// implment 24min
#include <stdio.h>
#include <string.h>
#include <algorithm>
#include <iostream>
#include <math.h>
#include <assert.h>
#include <vector>
#include <queue>
#include <string>
#include <map>
#include <set>

using namespace std;
typedef long long ll;
typedef unsigned int uint;
typedef unsigned long long ull;
static const double EPS = 1e-9;
static const double PI = acos(-1.0);

#define REP(i, n) for (int i = 0; i < (int)(n); i++)
#define FOR(i, s, n) for (int i = (s); i < (int)(n); i++)
#define FOREQ(i, s, n) for (int i = (s); i <= (int)(n); i++)
#define FORIT(it, c) for (__typeof((c).begin())it = (c).begin(); it != (c).end(); it++)
#define MEMSET(v, h) memset((v), h, sizeof(v))

int n;
string str;
string memo[60][60];

string max(const string &lhs, const string &rhs) {
  if (lhs.size() < rhs.size()) { return rhs; }
  if (lhs.size() > rhs.size()) { return lhs; }
  if (lhs < rhs) { return rhs; }
  return lhs;
}

string calc(int l, int r) {
  string &ret = memo[l][r];
  if (ret != "-") { return ret; }
  ret = "";
  if (l == r) { return ret; }
  if (r - l == 1 && str[l] == '0') { return ret = "0"; }

  // number
  if (str[l] != '0') {
    string temp = "";
    FOR(i, l, r) {
      if (str[i] == '?') { temp += "9"; }
      else if (isdigit(str[i])) { temp += str[i]; }
      else { temp = ""; break; }
    }
    ret = max(ret, temp);
  }

  // L or R
  if ((str[l] == 'L' || str[l] == 'R' || str[l] == '?') &&
      (str[l + 1] == '(' || str[l + 1] == '?') &&
      (str[r - 1] == ')' || str[r - 1] == '?') &&
      r - l > 3) {
    FOR(m, l + 2, r) {
      string left = calc(l + 2, m);
      string right = calc(m + 1, r - 1);
      if (str[m] != ',' && str[m] != '?') { continue; }
      if (left == "" || right == "") { continue; }
      if (str[l] == 'L' || str[l] == '?') { ret = max(ret, left); }
      if (str[l] == 'R' || str[l] == '?') { ret = max(ret, right); }
    }
  }
  return ret;
}

int main() {
  while (cin >> str) {
    n = str.size();
    REP(i, 60) REP(j, 60) { memo[i][j] = "-"; }
    string ans = calc(0, n);
    if (ans == "") {
      cout << "invalid" << endl;
    } else {
      cout << ans << endl;
    }
  }
}