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

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    vector<long>sz={1};
    long add=6;
    while(sz.size()<33)
    {
        long nxt=sz.back()+add;
        sz.push_back(nxt);
        add*=4;
    }
    auto dfs=[&](auto dfs, long n, long k)->char
    {
        if(n==1)return "yuusaan"[k];
        long len=0;
        if(k<len+1)return 'y';
        len+=1;
        if(k<len+sz[n-1])return dfs(dfs,n-1,k-len);
        len+=sz[n-1];
        if(k<len+sz[n-1])return dfs(dfs,n-1,k-len);
        len+=sz[n-1];
        if(k<len+1)return 's';
        len+=1;
        if(k<len+sz[n-1])return dfs(dfs,n-1,k-len);
        len+=sz[n-1];
        if(k<len+sz[n-1])return dfs(dfs,n-1,k-len);
        len+=sz[n-1];
        return 'n';
    };
    long N,K;
    cin>>N>>K;
    if(N>=30)
    {
        if(K<=N)
        {
            cout<<'y'<<endl;
            return 0;
        }
        K-=N-30;
        N=30;
    }
    cout<<dfs(dfs,N,K-1)<<endl;
}