Question

how to find value modulus

Answer 1

you have to give more details here, but from what i understood, you asked how to calculate values in modulus, and for calculating values in modulus function we always take the positive (+) value of whatever value we are currently getting as the answer.

for example: if my current answer inside the modulus is -346 then my answer, after applying modulus function will be +346

Answer 2

modulus changes negative number to positive
For e.g.
|4-8| = |-4| = 4

| - sign of modulus