import sys

# Define the mapping based on the provided examples.
# This dictionary stores the number-to-character correspondence.
# Based on the examples:
# 3 -> k
# 8 -> e
# 7 -> d
# 4 -> i
mapping = {
    3: 'k',
    8: 'e',
    7: 'd',
    4: 'i'
    # If the problem intended a longer, standard string (like 'aikokushin',
    # 'keyence', 'atcoder', etc.) and the examples were selective or
    # slightly off, this map would need to be adjusted.
    # However, based *strictly* on the given examples, this is the direct mapping.
    # For example, if the string was 'aikokushin' (1-based index):
    # mapping = {i: c for i, c in enumerate('aikokushin', 1)}
    # But this doesn't match all examples (e.g., 8->h, not e).
    # Therefore, we use the explicit mapping from the examples.
}

# Read input line by line until 0 is encountered
while True:
    try:
        # Read a line from standard input
        line = sys.stdin.readline()

        # If input stream ends unexpectedly before 0, stop.
        if not line:
            break

        # Convert the read line (string) to an integer
        # .strip() removes leading/trailing whitespace (like the newline character)
        num = int(line.strip())

        # Check for the termination condition (input is 0)
        if num == 0:
            break

        # If the number is not 0, find its corresponding character
        # using the 'mapping' dictionary and print it.
        # It's assumed that any non-zero input number will be a key
        # present in the 'mapping' dictionary based on the problem statement
        # implicitly defining the required mappings through examples.
        # If a number not in the examples appeared, this would cause a KeyError.
        print(mapping[num])

    except EOFError:
        # End of file reached
        break
    except ValueError:
        # Input was not a valid integer, which contradicts the problem statement.
        # Stop processing in this unexpected case.
        # print("Invalid input encountered.", file=sys.stderr) # Optional error message
        break
    # No need to explicitly handle KeyError if we trust the problem statement
    # implies only numbers from examples (or 0) will be input.