#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, t) for (ll i = s; i < (ll)(t); i++)

template<typename T>
bool chmin(T &x, T y) { return x > y ? (x = y, true) : false; }
template<typename T>
bool chmax(T &x, T y) { return x < y ? (x = y, true) : false; }

struct io_setup {
	io_setup() {
		ios::sync_with_stdio(false);
		std::cin.tie(nullptr);
		cout << fixed << setprecision(15);
	}
} io_setup;

using mint=atcoder::modint998244353;

int main(){
	ll n,k;
	cin>>n>>k;
	string s="yuusaan";
	k--;
	if(n>k){
		cout<<"y\n";
		return 0;
	}

	if(n>26){
		int x=-1;
		rep(i,1,27){
			ll tmp=(1LL<<(i*2))*2-1+n-i;
			if(tmp>k){
				x=i;
				break;
			}
		}
		k-=(n-x);
		n=x;
	}

	while(n>1){
		ll tmp=(1LL<<((n-1)*2))*2-1;
		if(k==0){
			cout<<"y\n";
			return 0;
		}
		k--;

		if(k<tmp){
			n--;
			continue;
		}else k-=tmp;
		if(k<tmp){
			n--;
			continue;
		}else k-=tmp;

		if(k==0){
			cout<<"s\n";
			return 0;
		}
		k--;

		if(k<tmp){
			n--;
			continue;
		}else k-=tmp;
		if(k<tmp){
			n--;
			continue;
		}else k-=tmp;

		if(k==0){
			cout<<"n\n";
			return 0;
		}
		k--;
		assert(0);
	}
	cout<<s.at(k)<<endl;
}