import sys
input = sys.stdin.readline

N=int(input())

ANS=[]

while N>0:
    if N==1:
        break
    if N%2==1:
        ANS.append("ab")
        N-=1
        continue
    p=0

    while N%2==0:
        p+=1
        N//=2

    ANS+=["c"]*(p)

S=ANS+ANS[::-1]

print("".join(S))