import random

no_range = 100

a_noel = random.randrange(1,no_range) #number of loops to fill a
b_noel = random.randrange(1,no_range) #number of loops to fill b

a = []
b = []
c = []

for x in range(0,a_noel):
    a.append(random.randrange(1,no_range)) #adds a_noel number of random numbers to a

for y in range(0,b_noel):
    b.append(random.randrange(1,no_range)) #adds b_noel number of random numbers to b

for z in a:
    if z in b and z not in c:
        c.append(z) #fills c with common numbers in a and b

print(c)