#Signal report.py
a = eval(input())
#这里要整除
readability = a // 10
strength = a - readability * 10
# print(readability)
# print(strength)
# 定义 strength 列表
slist = [
"Faint signals, barely perceptible",
"Very weak signals",
"Weak signals",
"Fair signals",
"Fairly good signals",
"Good signals",
"Moderately strong signals",
"Strong signals",
"Extremely strong signals"]
# 定义 readability 列表
rlist = [
"unreadable",
"barely readable, occasional words distinguishable",
"readable with considerable difficulty",
"readable with practically no difficulty",
"perfectly readable"]
#输出 列表索引从第0位开始
print(slist[strength-1],",",rlist[readability-1],".")