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Discussion of Problem 1880. Psych Up's Eigenvalues

what is in test №37?
Posted by Rodion 8 Aug 2020 18:57
this is my code
a=int(input())
b = [int(a) for a in input().split()]
c=int(input())
d = [int(c) for c in input().split()]
e=int(input())
f=[int(e) for e in input().split()]
spisok=b+d+f
spisok.sort()
kolich=0
for i in range(0, len(spisok)-1):
    if spisok[i-1]==spisok[i] and spisok[i]==spisok[i+1]:
        kolich+=1
print(kolich)

i dont know why but it writes wrong answer on test №37
please could you text me what is on this test