def repeatedString(s, n):
    converged = s*n
    got_it = converged[0:n]
    count = 0
    for x in got_it:
        if "a" in x:
           count += 1
    return count
s = input()
n = int(input())
result = repeatedString(s, n)
print(result)

a
1000000000000

Traceback (most recent call last):
  File "programs.py", line 11, in <module>
    result = repeatedString(s, n)
  File "programs.py", line 2, in repeatedString
    converged = s*n
MemoryError