Prime power, prime exponent

Find all positive integers x,y x,y and positive prime numbers p p such that

pxyp=1.p^x-y^p = 1.

Enter your answer as the sum (pi+xi+yi), \sum(p_i+x_i+y_i), where the sum runs over the solutions (p,x,y) (p,x,y) to the equation.

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