Walid(Python)

#code
l=[]
cnt=0
i=-1
while True:
    try:
        n=int(input())
        l.append(n)
        i+=1
        if i>0:
            if l[i]==l[i-1]:
                cnt+=1
                if cnt==2:
                    print(n)

            else:
                cnt=0

    except EOFError:
        break