digit_to_char = {
    0: 'o',  # Assuming 0 maps to 'o' if needed, but 0 is the termination signal
    1: 'v',
    2: 'e',
    3: 'k',
    4: 'i',
    5: 'j',
    6: 'm',
    7: 'd',
    8: 'e',
    9: 'f'
}

while True:
    try:
        n = int(input())
        if n == 0:
            break
        print(digit_to_char[n])
    except EOFError:
        break