#include <stdio.h>

#define MAX_SIZE 20

void encode(char* number)
{
	char letters [] = "XCOMPUTERS"; 
	char numbers [] = "0123456789";
	int index;
	
	while (*number)
	{
		index = 0;
		
		while (numbers[index] && *number != numbers[index])
			++index;
		
		if (index == 10)
			putchar(*number);
		else 
			putchar(letters[index]);
		
		++number;
	}	
}

int main(void)
{
	char in_string [MAX_SIZE];
	
	puts("Enter a number: ");
	
	if (fgets (in_string, MAX_SIZE, stdin) != NULL)
		encode(in_string);

	
	return 0;
}