djfz-2019/TaskA40/run

#!/usr/bin/python3
import sys
import re

def is_number(test):
    pattern = re.compile(r'^(1 roczek)|(2 latka)|(3 latka)|(4 latka)|(([0-9]|[1-9][0-9]|10[0-9]|110) (lat))$')
    
    result = re.match(pattern, test)
    if result:
        return "yes"
    else:
        return "no"

for line in sys.stdin:
	print(is_number(line))