#include<bits/stdc++.h>

using namespace std;

#define ll long long
#define vll vector<ll>
#define pb push_back

ll check(string a, vll p) {
	ll val1 = -1;
	ll val2 = -1;

	ll res = 0;
	ll res2 = 0;

	ll counter = p.size() - 1;

	for (ll i = a.size() - 1; i >= 0; i--) {
		if (a[i] == '?') {
			if (val1 == -1) {
				val1 = p[counter];
				counter--;
			} else {
				val2 = p[counter];
				counter--;
			}
		} else {
			if (a[i] == 'n') {
				if (val2 == -1 && val1 == -1) {
					res = min(res, res2);
				} else if (val2 == -1) {
					res2 = res;
					res = min(res, val1);
				} else {
					res = min(val1, val2);
				}
			} else {
				if (val2 == -1 && val1 == -1) {
					res = max(res, res2);
				} else if (val2 == -1) {
					res2 = res;
					res = max(res, val1);
				} else {
					res = max(val1, val2);
				}
			}

			val1 = -1;
			val2 = -1;
		}
	}

	return res;
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);

	string a; cin >> a;

	string r;

	ll counter = 0;

	for (ll i = 0; i < a.size(); i++) {
		if (a[i] == 'n') {
			r.pb('n');
		}

		if (a[i] == 'x') {
			r.pb('x');
		}

		if (a[i] == '?') {
			r.pb('?');
			counter++;
		}
	}

	vll vals;
	set<ll> res;

	for (ll i = 1; i <= counter; i++){
		vals.pb(i);
	}

	do {
		res.insert(check(r, vals));
	} while(next_permutation(vals.begin(), vals.end()));

	cout << res.size() << endl;

	return 0;
}