Reverse number to a module m

The retu number is given two integers M and a. If there is no reverse number to a by module M, then remove the number & minus; 1, and if it exists, then withdraw this number (the answer should lie within the boundaries from 0 to m & minus; 1).

in the only line of the input data is given two integers 1

weekend. Wit the response to the response to the response Task.

Exploration Entry 179 57 Conclusion 22

  b =  0  a =  list  ( map  ( int ,  input  (). Split ()) b =  pow  (a [ 1 ], a [ 0 ] -  2 , a [ 0 ])   if   pow  (a [ 1 ], a [ 0 ] -  2 , a [ 0 ]) ==  0 :   print  (- 1 )   else :   Print  (b)