def find_kth_character():
    import sys
    N, K = map(int, sys.stdin.readline().split())
    s = "yuusaan"
    current_level = N
    current_k = K
    
    while current_level > 1:
        for c in s:
            if c in ['u', 'a']:
                # Calculate the block size contributed by this 'u' or 'a' up to current_level
                block_size = 7 ** (current_level - 1)
            else:
                block_size = 1
            
            if current_k > block_size:
                current_k -= block_size
            else:
                if c in ['u', 'a']:
                    current_level -= 1
                else:
                    print(c)
                    return
                break  # Break the for loop to restart processing with new current_level and current_k
    # When current_level is 1, directly access the string
    print(s[current_k - 1])

find_kth_character()