#include <iostream>
 
using namespace std;
 
string a[10] = {"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"};
string b[10] = {"ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"};
string c[10] = {"tmp", "ten", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"};
 
int main() {
	int n;
	cin >> n;
	if (n < 10)
		cout << a[n];
	else if (n < 20)
		cout << b[n % 10];
	else {
		cout << c[n / 10];
		if (n % 10)
			cout << '-' << a[n % 10];
	}
	cout << endl;
}

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