Merkkijono

n = int(input())


a = ["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p"]


s = []
g = 0
for i in range(1,n+1):
    g = 0
    if i == 1:
        s.append(a[0])
        continue
    l = len(s)
    while g <= 2*l+1:
        s.insert(g, a[i-1]) 
        g += 2
    
st = ""

for i in s:
    st += i

print(st)

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: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED