word = 'MARTINA'
so_far = "-" * len(word)
guessed_letters = [ 'A', 'N', 'a' ]
#new = ''
for guess in guessed_letters:
if guess in word:
print('Tak litera jest w słowie')
new = ''
for i in range(len(word)):
if guess == word[i]:
new += guess
else:
new += so_far[i]
so_far = new
print(so_far)
else:
print(f"Podanej litery '{guess}' nie ma w słowie")