N = input()
n = N
"""
ls = [(4000,16008003),(3000,9006003),(2500,6255003),(500,251003),(400,160803),(250,63003),(100,10203),(50,2603),(0,3)] 

"""
ls = []
def calc(n):
    ret = 0
    while (n!=-1):
        ret += n
        n-=2
    return ret

for i in range(8001,501,-400):
    ls.append(((i-1)/2,calc(i)+2))
ls += [(100,10203),(50,2603),(0,3)] 



print ls

ans = ""
for p,q in ls:
    base = "a" + "xy"*p + "x" + "b"
    a = n/q
    n = n%q
    ans = ans + base*a

ans += "io"[:n]

print ans