import string

def pr1():
    print("A", {i*i for i in range(1001) if i%10 == 5})
    print("B", {i*j for i in range(1,100) for j in range(1,100) if i%10 == 5 and j%10 == 5})
    print("C", {i*j*k for i in range(1, 10) for j in range(1, 10) for k in range(1, 10) if \
          i!=j and j!=k and i!=k})

def pr2():
    return {x:0 for x in string.ascii_letters}

def pr3(astring):
    # The usual pattern for checking.  If we find a good character, we know that the string is good.
    #But we can only say that a string is bad if _all_ letters have been investigated.
    for character in astring:
        if character in string.ascii_letters:
            return True
    return False

def pr4(file_name):
    with open(file_name) as inf:
        line_counter, word_counter, letter_counter = 0, 0, 0
        for line in inf:
            if len(line)>1:
                line_counter += 1
            for word in line.split():
                if pr3(word):
                    word_counter += 1
            for character in line:
                if character in string.ascii_letters:
                    letter_counter += 1
    return line_counter, word_counter, letter_counter
    
def pr5(file_name):
    with open(file_name) as inf:
        for line in inf:
            for word in line.split():
                word = word.strip(string.punctuation)
                try:
                    print(int(word))
                except ValueError:
                    pass