IndexError: list index out of range

word = input().split(' -> ')
n = int(input())
lst = []
for _ in range(n + 1):
    word1 = input()
    if word.index(word1) == 0:
        lst.append(f'{word[word.index(word1)]} -> {word[word.index(word1) + 1]}')
    elif word.index(word1) == -1:
        lst.append(f'{word[word.index(word1) - 1]} -> {word[word.index(word1)]}')
    else:
        lst.append(f'{word[word.index(word1) - 1]} -> {word[word.index(word1)]} -> {word[word.index(word1) + 1]}')
print(*lst, sep='\n')
 
Выдает ошибку 
Traceback (most recent call last):
  File "C:\Users\Asik\PycharmProjects\pythonProject\aasaddas.py", line 11, in <module>
    lst.append(f'{word[word.index(word1) - 1]} -> {word[word.index(word1)]} -> {word[word.index(word1) + 1]}')

queue = input().split(' -> ')
n = int(input())
res = []
for i in range(n):
    person = input()
    index = queue.index(person)
    res = [queue[x] for x in range(index-1, index+2) if x >= 0 and x < len(queue)]
    print(' -> '.join(res))

word = input().split(' -> ')
n = int(input())
lst = []
for _ in range(n):
    word1 = input()
    if word.index(word1) == 0:
        lst.append(f'{word[word.index(word1)]} -> {word[word.index(word1) + 1]}')
    elif word.index(word1) == len(word)-1:
        lst.append(f'{word[word.index(word1) - 1]} -> {word[word.index(word1)]}')
    else:
        lst.append(f'{word[word.index(word1) - 1]} -> {word[word.index(word1)]} -> {word[word.index(word1) + 1]}')
print(*lst, sep='\n')

word = input().split(' -> ')
n = int(input())
lst = []
for _ in range(n):
    word1 = input()
    if word.index(word1) == 0:
        lst.append(f'{word1} -> {word[word.index(word1) + 1]}')
    elif word.index(word1) == len(word) - 1:
        lst.append(f'{word[word.index(word1) - 1]} -> {word1}')
    else:
        lst.append(f'{word[word.index(word1) - 1]} -> {word1} -> {word[word.index(word1) + 1]}')
print(*lst, sep='\n')

word = input().split(' -> ')
n = int(input())
lst = []
for _ in range(n):
    word1 = input()
    index = word.index(word1)
    if index == 0:
        lst.append(f'{word1} -> {word[index + 1]}')
    elif index == len(word) - 1:
        lst.append(f'{word[index - 1]} -> {word1}')
    else:
        lst.append(f'{word[index - 1]} -> {word1} -> {word[index + 1]}')
print(*lst, sep='\n')

lst = []