import io
import sys

sys.stdin = io.StringIO('WHERETHEREISAWILLTHEREISAWAY')

s_in = input()

# print(s_in)

# n = 97
# prime = [1] * (n + 1)
# prime[0] = prime[1] = 0
# for i in range(2, n + 1):
#     j = i * i
#     while j <= n:
#         prime[j] = 0
#         j += i
#
# print(prime)
# for idx, num in enumerate(prime):
#     if num:
#         print(idx)