# Predefined mapping based on the problem's examples
mapping = {
    0: '',  # Termination signal, no output
    3: 'k',
    4: 'i',
    7: 'd',
    8: 'e'
}

# Read lines until 0 is encountered
import sys
for line in sys.stdin:
    num = int(line.strip())
    if num == 0:
        break
    if num in mapping:
        print(mapping[num])
    else:
        # Handle unknown numbers if required (not covered in examples)
        print('')  # Placeholder for completeness, though not needed per problem constraints