#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
#define fix(x) fixed << setprecision(x)
#define asc(x) x, vector<x>, greater<x>
#define rep(i, n) for(ll i = 0; i < n; ++i)
#define all(x) (x).begin(),(x).end()
template<class T>bool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool chmax(T&a, const T&b){if(a<b){a=b;return 1;}return 0;}
constexpr ll INFLL = (1LL << 62), MOD = 998244353;
constexpr int INF = (1 << 30);

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    ll n,k;
    cin >> n >> k;
    --k;
    vector<ll> x(60);
    string s = "yuusaan";
    auto dfs = [&](auto self, int i, ll k) -> char {
        if(i==0) return s[k];
        if(k<x[i-1]) return self(self, i-1, k);
        k -= x[i-1];
        if(k<5) return s[k+1];
        k -= 5;
        return self(self, i-1, k);
    };
    rep(i,n){
        if(i==0) x[i] = 7;
        else x[i] = x[i-1] * 2 + 5;
        if(x[i]>k){
            cout << dfs(dfs,i,k) << '\n';
            return 0;
        }
    }
    return 0;
}