#include <cstdlib>
#include <array>
#include <iostream>
#include <string>


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

  std::string s;
  std::cin >> s;

  int maxLen = -1;
  std::string::size_type pos = -1, cpos = -1;
  do {
    if ((cpos = s.find('c', cpos + 1)) == std::string::npos) {
      break;
    } else {
      pos = cpos;
      while (pos + 1 < s.length() && s[++pos] == 'c');
      pos--;
    }

    std::array<std::string::size_type, 3> ps{pos, pos, pos};
    int idx = 1;
    bool isFail = false;
    for (const auto& c : {'w', 'w'}) {
      if ((pos = s.find(c, pos + 1)) == std::string::npos) {
        isFail = true;
        break;
      } else {
        ps[idx++] = pos;
      }
    }
    if (!isFail) {
      maxLen = ps[2] - ps[0] + 1;
    }
  } while (pos != std::string::npos);
  std::cout << maxLen << std::endl;

  return EXIT_SUCCESS;
}