N = input()
n = N
ls = [(500,251003),(250,63003),(50,2603),(0,3)] 

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