import string
P = int(input())
B = int(input())

def hash(S):
    res = 0
    for s in S:
        res = (res * B + s) % P
    return res

D1 = {'': 0}
D2 = {}

def dfs(s):
    v = (D1[s[:-1]] + ord(s[-1])) % P
    D1[s] = v
    if v in D2:
        print(s)
        print(D2[v])
        exit()
    else:
        D2[v] = s
    if len(s) == 10**4:
        return
    for c in string.ascii_lowercase:
        dfs(s+c)

for c in string.ascii_lowercase:
    dfs(c)