What's wrong with the following code?

try:
    n=int(input())
    word=[]
    for _ in range(n):
        val=input()
        for i in val:
            if i=="'" or i=='.' or i==',' or i==';' or i==':' or i=='?':
                word.append(' ')
            else:
                word.append(i.lower())
        word.append(' ')
    hold=''.join(word)
    word=list(set(hold.split()))
    print(len(word))
    for i in sorted(word):
        print(i)
except:
    pass