#include<stdio.h>
int main()
{
	int num,fd,ld,flag=0;

	printf("Enter a two-digit number: ");
	scanf("%d",&num);

	if((num < 10) || (num > 99))
	{
		printf("Incorrect input: Please enter a two-digit number\n");
	}
	else
	{

	fd = num/10;
	ld=num%10;

	switch(fd)
	{
		case 1: 
					switch(ld)
					{
						case 0: printf("ten");break;
						case 1: printf("eleven");break;
						case 2: printf("twelve");break;
						case 3: printf("thirteen");break;
						case 4: printf("fourteen");break;
						case 5: printf("fifteen");break;
						case 6: printf("sixteen");break;
						case 7: printf("seventeen");break;
						case 8: printf("eighteen");break;
						case 9: printf("nineteen");break;
					}
					break;
		case 2:
					printf("twenty");
					flag = 1;
					break;
		case 3:
					printf("thirty");
					flag = 1;
					break;
		case 4:
					printf("forty");
					flag = 1;
					break;
		case 5:
					printf("fifty");
					flag = 1;
					break;
		case 6:
					printf("sixty");
					flag = 1;
					break;
		case 7:
					printf("seventy");
					flag = 1;
					break;
		case 8:
					printf("eighty");
					flag = 1;
					break;
		case 9:
					printf("ninety");
					flag = 1;
					break;
	}
	if(flag == 1)
	{
		switch(ld)
		{
			case 1: printf("-one");break;
			case 2: printf("-two");break;
			case 3: printf("-three");break;
			case 4: printf("-four");break;
			case 5: printf("-five");break;
			case 6: printf("-six");break;
			case 7: printf("-seven");break;
			case 8: printf("-eight");break;
			case 9: printf("-nine");break;
		}
	}		
	printf("\n");
	}
}