A.cpp

#include <bits/stdc++.h>

#define FOR(i,a,b) for(int i=(a),_b=(b); i<=_b; i++)
#define FORD(i,a,b) for(int i=(a),_b=(b); i>=_b; i--)
#define REP(i,a) for(int i=0,_a=(a); i<_a; i++)
#define EACH(it,a) for(__typeof(a.begin()) it = a.begin(); it != a.end(); ++it)

#define DEBUG(x) { cout << #x << " = "; cout << (x) << endl; }
#define PR(a,n) { cout << #a << " = "; FOR(_,1,n) cout << a[_] << ' '; cout << endl; }
#define PR0(a,n) { cout << #a << " = "; REP(_,n) cout << a[_] << ' '; cout << endl; }

#define sqr(x) ((x) * (x))
using namespace std;

string get(int n) {
    if (n < 20) {
        switch (n) {
            case 0:
                return "zero";
            case 1:
                return "one";
            case 2:
                return "two";
            case 3:
                return "three";
            case 4:
                return "four";
            case 5:
                return "five";
            case 6:
                return "six";
            case 7:
                return "seven";
            case 8:
                return "eight";
            case 9:
                return "nine";
            case 10:
                return "ten";
            case 11:
                return "eleven";
            case 12:
                return "twelve";
            case 13:
                return "thirteen";
            case 14:
                return "fourteen";
            case 15:
                return "fifteen";
            case 16:
                return "sixteen";
            case 17:
                return "seventeen";
            case 18:
                return "eighteen";
            case 19:
                return "nineteen";
        }
    }
    else {
        if (n % 10 == 0) {
            switch (n) {
                case 20:
                    return "twenty";
                case 30:
                    return "thirty";
                case 40:
                    return "forty";
                case 50:
                    return "fifty";
                case 60:
                    return "sixty";
                case 70:
                    return "seventy";
                case 80:
                    return "eighty";
                case 90:
                    return "ninety";
            }
        }
        else return get(n - n % 10) + "-" + get(n % 10);
    }
}

int main() {
    ios :: sync_with_stdio(false);
    int n; while (cin >> n) cout << get(n) << endl;
    return 0;
}