import re
import sys

def substitute_digits(match):
    digits = match.group()
    substitution_dict = {str(i): chr(ord('a') + i) for i in range(10)}
    return ''.join(substitution_dict[digit] for digit in digits)

def substitute_4digits(input_string):
    pattern = re.compile(r'\d{4}')
    result = re.sub(pattern, substitute_digits, input_string)
    return result




for line in sys.stdin:
            
    result = substitute_4digits(line)
    sys.stdout.write(result)