#include using namespace std; struct iofast_t { iofast_t() { ios::sync_with_stdio(false); cin.tie(nullptr); } } iofast; struct uns_t {} uns; template auto vec(Element init, Head arg, Args ...args) { if constexpr (sizeof...(Args) == 0) return std::vector(arg, init); else return std::vector(arg, vec(init, args...)); } template auto vec(uns_t, Head arg, Args ...args) { return vec(Element(), arg, args...); } template > T &chmin(T &l, T r, Compare &&f = less()) { return l = min(l, r, f); } template > T &chmax(T &l, T r, Compare &&f = less()) { return l = max(l, r, f); } int main() { string s; cin >> s; auto t = s.substr(0, s.find("pain")); if (s == t) { cout << -1 << endl; return 0; } int count = 0; for (int i = 0; i < size(t); ++i) { count += t.substr(i, 3) == "pon"; } if (count < 2) { cout << -1 << endl; return 0; } cout << count - 1 << endl; }