#include <bits/stdc++.h>
using namespace std;
int sum[3];
int main() {
  char str[100000 + 10];
  cin >> str;
  for (int i = 0; i < strlen(str); ++i) {
    if (str[i] == 'a') sum[0]++;
    if (str[i] == 'b') sum[1]++;
    if (str[i] == 'c') sum[2]++;
  }
  sort(sum, sum + 3);
  cout << sum[2] << sum[1] << sum[0] << endl;
  if (2 * sum[2] - sum[1] - sum[0] > 2)
    cout << "NO" << endl;
  else
    cout << "YES\n";
  return 0;
}
