#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;
    if(N >= K){cout << "y" << endl; return 0;}
    vector<long long> len(27);
    long long l = 1,add = 6;
    for(int i=0; i<27; i++){
        len.at(i) = l;
        l += add; add *= 4;
    }

    string s = "yuusaan";
    char answer;
    auto dfs = [&](auto dfs,int level,long long left) -> void {
        level--;
        if(level == 0){
            answer = s.at(left-1);
            cout << s.at(left-1) << endl;
            return;
        }
        if(left == 1){answer = 'y'; cout << "y" << endl; return;} 
        left--;
        if(left <= len.at(level)){dfs(dfs,level,left); return;}
        left -= len.at(level);
        if(left <= len.at(level)){dfs(dfs,level,left); return;}
        left -= len.at(level);
        if(left == 1){answer = 's'; cout << "s" << endl; return;}
        left--;
        if(left <= len.at(level)){dfs(dfs,level,left); return;}
        left -= len.at(level);
        if(left <= len.at(level)){dfs(dfs,level,left); return;}
        left -= len.at(level);
        if(left == 1){answer = 'n'; cout << "n" << endl; return;}
        assert(false);
    };
    long long dec = max(0LL,N-27);
    dfs(dfs,min(N,27LL),K-dec);
    return 0;

    for(int i=2; i<=N; i++){
        string t = "";
        for(auto &c : s){
            if(c == 'u' || c == 'a') t += "yuusaan";
            else t += c;
        }
        swap(s,t);
    }
    if(s.at(K-1) != answer){
        cout << N << " " << K << endl;
        cout << s.at(K-1) << " " << answer << endl;
        assert(false);
    }
    //cout << s.at(K-1) << endl;
}