# 535A : TAVAS AND NAFAS
# Prerequisite : Implementation

dictionary={
0:'zero', 	10:'ten',
1:'one', 	11:'eleven',
2:'two', 	12:'twelve',  	20: 'twenty',
3:'three', 	13:'thirteen',	30: 'thirty',
4:'four', 	14:'fourteen',  40:	'forty',
5:'five', 	15:'fifteen',   50:	'fifty',
6:'six', 	16:'sixteen', 	60:	'sixty',
7:'seven',  17:'seventeen', 70:	'seventy',
8:'eight',  18:'eighteen',  80:	'eighty',
9:'nine',	19:'nineteen',  90:	'ninety'
}

n=int(raw_input())
if(n<=20 or n%10==0):print dictionary[n]
else: print '{}-{}'.format(dictionary[(n//10)*10],dictionary[n%10])