n,k = map(int,input().split())
if 100 < n :
    if k <= n :
        print('y')
        exit()
    k -= n - 100
    n = 100
l = [7]
for _ in range(105) :
	l.append(l[-1] * 4 + 3)
def f(n,k) :
    if n == 0 :
        return "yuusaan"[k]
    for c in "yxxsxxn" :
        if c == 'x' :
            if k < l[n-1] :
                return f(n-1,k)
            k -= l[n-1]
        elif k == 0 :
            return c
        else :
            k -= 1
print(f(n-1,k-1))