# Read each line until 0 is encountered
import sys

digit_map = {
    1: 'a',
    2: 'b',
    3: 'k',
    4: 'i',
    5: 'o',
    6: 'm',
    7: 'd',
    8: 'e',
    9: 'n'
}

for line in sys.stdin:
    num = int(line.strip())
    if num == 0:
        break
    print(digit_map[num])