import sys, time, random
from collections import deque, Counter, defaultdict
def debug(*x):print('debug:',*x, file=sys.stderr)
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 61 - 1
mod = 998244353

n, k = mi()
n -= 1
k -= 1
S = 'yuusaan'
n = min(n, 60)
cnt = [4]
L = [7]
for i in range(min(n, 40)):
    cnt.append(cnt[-1] * 4)
    L.append(L[-1] + 6 * cnt[-2])


def solve(n, k):
    if n == 0:
        return S[k]
    else:
        mid = 'uusaa'
        if k == 0:
            return 'y'
        k -= 1
        if k < L[n - 1]:
            return solve(n - 1, k)
        k -= L[n - 1]
        if k < L[n - 1]:
            return solve(n - 1, k)
        k -= L[n - 1]
        if k == 0:
            return 's'
        k -= 1
        if k < L[n - 1]:
            return solve(n - 1, k)
        k -= L[n - 1]
        if k < L[n - 1]:
            return solve(n - 1, k)
        k -= L[n - 1]
        return 'n'
    
print(solve(n, k))