03. Speed Info

# 1. скорост (дробно/реално/десетично) -> float
# 2. проверка за скоростта
    # до 10 -> slow
    # до 50 -> average
    # до 150 -> fast
    # до 1000 -> ultra fast
    # над 1000 -> extremely fast

speed = float(input())

if speed <= 10:
    print('slow')
elif 10 < speed <= 50:
    print('average')
elif 50 < speed <= 150:
    print('fast')
elif 150 < speed <= 1000:
    print('ultra fast')
elif speed > 1000:
    print('extremely fast')