#include <iostream>
#include <vector>
using namespace std;
#define YES cout << "Yes" << endl
#define NO cout << "No" << endl

int main(void){
    int n;
    string s;
    cin >> n >> s;
    int mcnt = 0;
    string sub1, sub2;
    for (int i = 0; i < (int)s.size(); i++) {
    	sub1 = s.substr(i, 1);
    	sub2 = s.substr(i, 2);
    	if (sub2 == "w?") {
    		mcnt += 2;
    		i++;
    	}
    	else if (sub2 == "?a" || sub2 == "?o") {
    		mcnt += 2;
    		i++;
    	}
    	else if (sub2 == "wa" || sub2 == "wo") {
    		mcnt += 2;
    		i++;
    	}
    	else if (sub1 == "?" || sub1 == "n") {
    		mcnt++;
    		i++;
    	}
    }
    mcnt == (int)s.size() ? YES : NO;
}