#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;
    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";
    auto dfs = [&](auto dfs,int level,long long left) -> void {
        level--;
        if(level == 0){
            cout << s.at(left-1) << endl;
            return;
        }
        if(left == 1){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){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){cout << "n" << endl; return;}
        assert(false);
    };
    dfs(dfs,min(N,27LL),K);
}