#include <iostream>
#include <string>

using namespace std;

string DigitToString(int digit);

int main() {
    int i;

    for(i = 0; i < 10; i++) {
        cout << i << " is " << DigitToString(i) << "." << endl;
    }
    return 0;
}

string DigitToString(int digit){
    string word="Unknown";
    switch (digit) {
        case 0:
            word = "Zero";
            break;
        case 1:
            word = "One";
            break;
        case 2:
            word = "Two";
            break;
        case 3:
            word = "Three";
            break;
        case 4:
            word = "Four";
            break;
        case 5:
            word = "Five";
            break;
        case 6:
            word = "Six";
            break;
        case 7:
            word = "Seven";
            break;
        case 8:
            word = "Eight";
            break;
        case 9:
            word = "Nine";
            break;
        default:
            break;
    }

    return word;
}