1316 그룹 단어 체커

https://www.acmicpc.net/problem/1316

N = int(input())
count=0

for _ in range(N):
    a=list(input())
    
    sign=0
    if len(a)>=3:
            #j의 인덱스 부터 j다음 +2와 비교 해야함
        for i in range(len(a)-2):
              
            if sign==1: 
                break
            for k in range(i+2,len(a)):
                
                
                
                if a[i] == a[i+1]:

                    pass 
                    
                else:    
                    if a[i] == a[k]:
                    
                                      
                    
                        count+=1
                        sign=1
                        break
                    
                
    
print(N-count)