import fractions
import math

x = -3
a = abs(x)
print('a = {}'.format(a))
p = 12
q = 18
g = fractions.gcd(p, q)
print('g = {}'.format(g))
n = 3
z = q**n
print('z = {}'.format(z))
r = pow(q, 10**9 + 5, 10**9 + 7)
print('r = {}'.format(r))
s = math.sqrt(q)
print('s = {}'.format(s))