letter

start_letter = input()
end_letter = input()
skip_letter = input()

start_num = ord(start_letter)
end_num = ord(end_letter)
skip_num = ord(skip_letter)

counter = 0

for first in range(start_num, end_num + 1):
    for second in range(start_num, end_num + 1):
        for third in range(start_num, end_num + 1):
            if first == skip_num or second == skip_num or third == skip_num:
                continue
            else:
                counter += 1
                print(f"{chr(first)}{chr(second)}{chr(third)}", end=" ")

print(counter)