#include <bits/stdc++.h>
using namespace std;
const long long N = 100005;
string A;
void solve() {
  long long n, mi = 0, pl = 0;
  cin >> A;
  A = '+' + A;
  n = A.size() - 1;
  stack<char> s;
  for (__typeof((n)) i = (1); i <= (n); i++) {
    if (s.empty())
      s.push(A[i]);
    else if (s.top() == A[i])
      s.pop();
    else
      s.push(A[i]);
  }
  if (s.empty())
    cout << "Yes" << '\n';
  else
    cout << "No" << '\n';
}
signed main() {
  long long t;
  ios_base::sync_with_stdio(false);
  t = 1;
  while (t--) solve();
  return 0;
}
