Sanalista

count=0
times=int(input())
for i in range(times):
    LL=[]                 
    double=0
    word=input()
    for o in word:
        if o in LL:
            double+=1
            LL.remove(o)
        else:
            LL.append(o)
    if double/len(word)==0.5:
        count+=1
print(count)    

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED