import re
import sys

def num_to_lett(match):
    word = match.group(0)
    letters = []
    dict_mapping = {0: 'a', 1: 'b', 2: 'c', 3: 'd', 4: 'e', 5: 'f', 6: 'g', 7: 'h', 8: 'i', 9: 'j'}
    numbers = list(word)
    for number in numbers:
        letters.append(dict_mapping[int(number)])
    new_word = ''.join(letters)
    return new_word

for line in sys.stdin:
    modified_line = re.sub(r'[0-9]{4}', num_to_lett, line)
    print(modified_line.strip())