Ositus

import math

bell = lambda n: math.ceil(sum(k**n/math.e/math.factorial(k)for k in range(2*n)))

print(bell(len(input())))

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 3

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 4

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 5

Group: 2, 3

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 5, in <module>
    print(bell(len(input())))
  File "input/code.py", line 3, in <lambda>
    bell = lambda n: math.ceil(sum(k**n/math.e/math.factorial(k)for k in range(2*n)))
  File "input/code.py", line 3, in <genexpr>
    bell = lambda n: math.ceil(sum(k**n/math.e/math.factorial(k)for k in range(2*n)))
OverflowError: int too large to convert to float

Test 6

Group: 3

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 5, in <module>
    print(bell(len(input())))
  File "input/code.py", line 3, in <lambda>
    bell = lambda n: math.ceil(sum(k**n/math.e/math.factorial(k)for k in range(2*n)))
  File "input/code.py", line 3, in <genexpr>
    bell = lambda n: math.ceil(sum(k**n/math.e/math.factorial(k)for k in range(2*n)))
OverflowError: int too large to convert to float

Test 7

Group: 3

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 5, in <module>
    print(bell(len(input())))
  File "input/code.py", line 3, in <lambda>
    bell = lambda n: math.ceil(sum(k**n/math.e/math.factorial(k)for k in range(2*n)))
  File "input/code.py", line 3, in <genexpr>
    bell = lambda n: math.ceil(sum(k**n/math.e/math.factorial(k)for k in range(2*n)))
OverflowError: int too large to convert to float