import std.string,
       std.stdio;

void main() {
  size_t count;
  ulong ws;

  foreach_reverse (c; readln.chomp) {
    if (c == 'c') {
      count += ws * (ws - 1) / 2;
    } else if (c == 'w'){
      ws++;
    }
  }

  writeln(count);
}