import os,sys,random,threading
from random import randint,choice,shuffle
from copy import deepcopy
from io import BytesIO,IOBase
from types import GeneratorType
from functools import lru_cache,reduce
from bisect import bisect_left,bisect_right
from collections import Counter,defaultdict,deque
from itertools import accumulate,combinations,permutations
from heapq import  heapify,heappop,heappush
from typing import Generic,Iterable,Iterator,TypeVar,Union,List
from string import ascii_lowercase,ascii_uppercase,digits
from math import ceil,floor,sqrt,pi,factorial,gcd,log,log10,log2,inf
from decimal import Decimal,getcontext
from sys import stdin, stdout, setrecursionlimit
input = lambda: sys.stdin.readline().rstrip("\r\n")
MI = lambda :map(int,input().split())
li = lambda :list(MI())
ii = lambda :int(input())
mod = int(1e9 + 7) #998244353
inf = 1<<60
py = lambda :print("YES")
pn = lambda :print("NO")





MI=lambda:map(int,input().split())
n,k=MI()
INF=10**30
e=[1]
for _ in range(100):
    v=4*e[-1]+3
    if v>INF:v=INF
    e.append(v)
def E(y):
    if y<0:return 0
    if y>=len(e):return INF
    return e[y]
def jump(s,k):
    hi=min(s-1,k-1) if s>=1 else 0
    lo=0
    while lo<hi:
        mid=(lo+hi+1)//2
        if k-mid<=E(s-mid-1):lo=mid
        else:hi=mid-1
    return lo
def get(seed,s,k):
    while 1:
        if s==0:return seed
        if k==1:return 'y'
        k-=1
        L=E(s-1)
        if k<=L:
            s-=1
            t=jump(s,k)
            s-=t
            k-=t
            seed='u'
            continue
        k-=L
        if k<=L:
            s-=1
            seed='u'
            continue
        k-=L
        if k==1:return 's'
        k-=1
        if k<=L:
            s-=1
            seed='a'
            continue
        k-=L
        if k<=L:
            s-=1
            seed='a'
            continue
        return 'n'
S1='yuusaan'
if n==1:
    print(S1[k-1])
else:
    s=n-1
    for c in S1:
        L=1 if c in 'ysn' else E(s)
        if k<=L:
            if c in 'ysn':print(c)
            else:print(get(c,s,k))
            break
        k-=L