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#!/usr/bin/env python3
import string
import sys
def replace_digits(s: str) -> str:
"""
Replaces digits in a string with corresponding letters from the alphabet.
Args:
s (str): The input string.
Returns:
str: The modified string with digits replaced by letters.
"""
current_letter = None
solution = ''
alphabet = string.ascii_lowercase
for char in s:
if char.isdigit():
if current_letter is None:
raise ValueError('The first number must follow a letter.')
solution += alphabet[(alphabet.index(current_letter) +
int(char)) % 26]
else:
solution += char
current_letter = char
return solution
def main():
result = replace_digits(sys.argv[1])
print(result)
if __name__ == '__main__':
main()
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