import re

def substitute_digits(match):
    digit_mapping = {'0': 'a', '1': 'b', '2': 'c', '3': 'd', '4': 'e', '5': 'f', '6': 'g', '7': 'h', '8': 'i', '9': 'j'}
    return ''.join([digit_mapping[d] for d in match.group()])

if __name__ == "__main__":
    while True:
        try:
            line = input()
            if not line:
                break

            result = re.sub(r'\b\d{4}\b', substitute_digits, line)
            print(result)

        except EOFError:
            break