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fixed error (#3281)

this will fix code from randomly throwing `SystemExit: The affine cipher becomes weak when key B is set to 0. Choose different key` exception.
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NAVEEN S R committed
35eefac35917ad3b2b90a190929bf131ea13427b
Parent: f164e11
Committed by GitHub <noreply@github.com> on 10/14/2020, 9:53:37 AM