Merkkijono

n = int(input())

lista = ["a"]




if n>1:
    b=0
    for i in range (2):
        lista.insert(b, "b")
        b+=2

if n>2:
    c=0
    for i in range (4):
        lista.insert(c, "c")
        c+=2
if n>3:
    d=0
    for i in range (8):
        lista.insert(d, "d")
        d+=2
if n>4:
    e=0
    for i in range (16):
        lista.insert(e, "e")
        e+=2
if n>5:
    f=0
    for i in range (32):
        lista.insert(f, "f")
        f+=2
if n>6:
    g=0
    for i in range (64):
        lista.insert(g, "g")
        g+=2
if n>7:
    h=0
    for i in range (128):
        lista.insert(h, "h")
        h+=2
if n>8:
    i=0
    for k in range (256):
        lista.insert(i, "i")
        i+=2
if n>9:
    j=0
    for i in range (512):
        lista.insert(j, "j")
        j+=2
if n>10:
    k=0
    for i in range (2**10):
        lista.insert(k, "k")
        k+=2
if n>11:
    l=0
    for i in range (2**11):
        lista.insert(l, "l")
        l+=2
if n>12:
    m=0
    for i in range (2**12):
        lista.insert(m, "m")
        m+=2
if n>13:
    n=0
    for i in range (2**13):
        lista.insert(n, "n")
        n+=2
if n>14:
    o=0
    for k in range (2**14):
        lista.insert(o, "o")
        o+=2
if n>15:
    p=0
    for k in range (2**15):
        lista.insert(p, "p")
        p+=2


print(''.join(lista))

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: WRONG ANSWER

Test 15

Verdict: WRONG ANSWER

Test 16

Verdict: ACCEPTED