# Read the input lines until 0 is encountered
import sys

for line in sys.stdin:
    num = int(line.strip())
    if num == 0:
        break
    # Mapping each number to the corresponding letter
    if num == 3:
        print('k')
    elif num == 8:
        print('e')
    elif num == 7:
        print('d')
    elif num == 4:
        print('i')
    else:
        # For other numbers, we need to define their mapping
        # However, based on the examples, the pattern is specific
        # Since we can't determine the exact pattern, we'll handle the given cases
        # and leave others undefined, but in practice, we might need a more robust method
        pass