A38500.小特想散步

防窥线--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

#include<bits/stdc++.h>
using namespace std;

int main(){
    int a;
    char b[8];
    cin>>a;
    for(int i=1;i<=7;i++){
        cin>>b[i];
    }
    if(b[a]=='o'){
        cout<<"Yes";
    }else{
        cout<<"No";
    }
	return 0;
}