user_input = input('Type your text: ')
print(user_input)
amount_to_filter = 2

# creating dict with 'letter' : 'amount of times repeated' pairs
letters = {}
for letter in user_input:
    if letter not in letters: letters[letter] = 1
    else: letters[letter] += 1

# creating generator of letters that were repeated 'amount_to_filter' times
filtered_letters = [letter for letter, amount in letters.items() if amount == amount_to_filter]
print('Letters repeating %s times: %s' % (amount_to_filter, ' '.join(filtered_letters)))