n=int(input())
az='abcdefghijklmnopqrstuvwxyz'*300
fst=0
cnt=0
for i in range(n):
    len=i//26+1+cnt
    fst=(fst+len)%26
    end=fst+len
    if az[end]=='n':
        cnt+=1
        end+=1
    print(az[fst%26:end+1]+'n'*(i==n-1))