import string
def ispanagram(str):
    alp = "abcdefghijklmnopqrstuvwxyz"
    for char in alp:
        if char not in str.lower():
            return False
    return True
#main
str = 'The five boxing wizards jump quickly.'
if(ispanagram(str)==True):
    print("yes")
else:
    print("no")