def find_char(N, K):
    yuusaan = "yuusaan"
    if N == 1:
        return yuusaan[K-1]
    for c in yuusaan:
        if c in ['u', 'a']:
            l = 7
        else:
            l = 1
        if K <= l:
            pos_in_sub = K
            return find_char(N-1, pos_in_sub)
        else:
            K -= l
    return '?'

N, K = map(int, input().split())
print(find_char(N, K))