This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
n=int(input())
c=[]
t=[0 for i in range(5)]
for i in range(n):
    a=input()
    b=input()
    if a=="AA" and b=="AA":
        t[0]+=1
    elif a=="AA" and b[0]=="A":
        t[1]+=1
    elif a=="AA" and b[1]=="A":
        t[2]+=1
    elif a[0]=="A" and b=="AA":
        t[3]+=1
    else:
        t[4]+=1
s=sum(t)
b=0
for i in range(5):
    for j in range(i+1,5):   
        b+=t[i]*t[j] 
print(b)
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