Программа на Python:

word = "республика"
new_word = ""
for letter in word:
if letter == "р":
new_word += "б"
elif letter == "е":
new_word += "л"
elif letter == "с":
new_word += "и"
elif letter == "п":
new_word += "к"
elif letter == "у":
new_word += "б"
elif letter == "л":
new_word += "и"
elif letter == "и":
new_word += "к"
elif letter == "к":
new_word += "а"
elif letter == "а":
new_word += "р"
else:
new_word += letter
print(new_word)

Результат выполнения программы:

бликлиба