#!/usr/bin/python3

import re

def is_number(test):
    pattern = re.compile(r'^([A-Za-ĆŁŚŹŻ]\w*[^a]|Kosma|Jarema) [A-Za-ĆŁŚŹŻ]\w*$')
    
    result = re.match(pattern, test)
    if result:
        return "yes"
    else:
        return "no"

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