n=int(input())
lista=["b","c","d","e","f","g","h","i","j","l"]
list1=["0","1","2","3","4","5","6","7","8","9"]
ans=[]
for i in range(n):
    
    for j in range(10):
        i=str(i).replace(list1[j],lista[j])
    ans.append(i)

for k in range(n):
    if k<n-1:
        print("a"+ans[k]+"a")
    elif k==n-1:
        print("a"+ans[k]+"n")