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

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

    long long N,K; cin >> N >> K;
    string s = "yuusaan";
    if(N == 1 || K <= 7){
        cout << s.at(K-1) << endl;
        return 0;
    }
    vector<long long> len(50);
    long long add = 6,l = 1;
    for(int i=0; i<50; i++){
        len.at(i) = l;
        l += add; add *= 2;
    }

    auto dfs = [&](auto dfs,int level,long long left,bool y = true) -> void {
        if(level == 0){
            if(y) cout << "y" << endl;
            else cout << "n" << endl;
            return;
        }
        if(left > len.at(level-1)){
            left -= len.at(level-1);
            if(left <= 5){
                cout << s.at(left) << endl;
                return;
            }
            left -= 5;
            dfs(dfs,level-1,left,false);
        }
        else dfs(dfs,level-1,left,true);
    };
    dfs(dfs,min(50LL,N),K);

}