import numpy as np
#investment_1 = [5, 5, 5, 5, 5, 5]
#investment_2 = [12, -2, 10, 0, 7, 3]
#print(np.var(investment_1))
#print(np.var(investment_2))
arr = [15, 4, 3, 8, 15, 22, 7, 9, 2, 3, 3, 12, 6]
arr.sort()
print(np.std(arr))
aW1wb3J0IG51bXB5IGFzIG5wCiNpbnZlc3RtZW50XzEgPSBbNSwgNSwgNSwgNSwgNSwgNV0KI2ludmVzdG1lbnRfMiA9IFsxMiwgLTIsIDEwLCAwLCA3LCAzXQojcHJpbnQobnAudmFyKGludmVzdG1lbnRfMSkpCiNwcmludChucC52YXIoaW52ZXN0bWVudF8yKSkKCmFyciA9IFsxNSwgNCwgMywgOCwgMTUsIDIyLCA3LCA5LCAyLCAzLCAzLCAxMiwgNl0KYXJyLnNvcnQoKQpwcmludChucC5zdGQoYXJyKSk=