CCC 2018 J2 - Occupy Parking Solution

#Morgan Su, BayviewSS
#Comparing parking spot occupation with positions of C in either string
N=int(input())
dayOne=input()
dayTwo=input()

counter=0

for i in range(N):
    if dayOne[i]== 'C' and dayTwo[i]== 'C':
        counter+=1

print(counter)