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

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	ll n, k;
	cin >> n >> k;
	if(k <= n){
		cout << "y\n";
		return 0;
	}
	string s = "yuusaan";
	vector<ll> dp(1);
	dp[0] = 7;
	while(dp.back() <= 10'000'000'000'000'000ll){
		dp.push_back(dp.back() * 4 + 3);
	}
	ll d = max(0ll, n - (ll)dp.size());
	n -= d + 1;
	k -= d + 1;
	for(int i = n; i >= 1; i--){
		if(k == 0){
			cout << "y\n";
			exit(0);
		}
		if(k == 2 * dp[i - 1]){
			cout << "s\n";
			return 0;
		}
		if(k == dp[i] - 1){
			cout << "n\n";
			return 0;
		}
		k--;
		k %= dp[i - 1];
	}
	cout << s[k] << '\n';
}