#include <cstdlib>
#include <algorithm>
#include <iostream>
#include <string>


int
main()
{
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);

  std::string s;
  std::cin >> s;
  int len = static_cast<int>(s.length());
  int minLen = 101;
  // !!
  for (int i = 0; i < len; i++) {
    if (s[i] != 'c') continue;
    bool flag = false;
    for (int j = i + 1; j < len; j++) {
      if (s[j] != 'w') continue;
      for (int k = j + 1; k < len; k++) {
        if (s[k] == 'w') {
          minLen = std::min(minLen, k - i + 1);
          flag = true;
          break;
        }
      }
      if (flag) break;
    }
  }
  std::cout << (minLen == 101 ? -1 : minLen) << std::endl;

  return EXIT_SUCCESS;
}