16.py

s = input()
res = set()
while s:
    arr = s.split()
    for i in range(len(arr)):
        if "зайка" == arr[i]:
            if i > 0:
                res.add(arr[i - 1])
            if i < len(arr) - 1:
                res.add(arr[i + 1])


    s = input()

print(*list(res), sep="\n")