#include<stdio.h>
#include<string.h>
#include<ctype.h>

char letters[] = {'O', 'I', 'V', 'X', 'L', 'C', 'D', 'M'};
int values[] = {0, 1, 5, 10, 50, 100, 500, 1000};

int mem[10] = {0};
int memUsed[10] = {0};

#define EXPRL 10000

int issmaller(int rad, char letter)
{
	int i;
	int res = 0;
	for (i = 0; i < rad; i++)
	{
		if (letters[i] == letter)
		{
			res = i + 1;
			return res;
		}
	}
	return res;
}

typedef enum state {rn, und} state;

int getvalue(char letter)
{
	int i = 0;
	for (; i < 8; i++)
		if (letters[i] == letter)
			return values[i];
	return 0;
}

int isgreater(char l1, char l2)
{
	return getvalue(l1) < getvalue(l2);
}


void toRoman(int n)
{
	int rady[4];
	int i;
	for (i = 0; i < 4; i++)
	{
		
		if (i != 3)
		rady[i] = n % 10;
		else
		rady[i] = n ;
		n /= 10;
	}
	char buffer[EXPRL+1];
	int pos = 0;
	switch (rady[0])
	{
		case 3:
			buffer[pos++] = 'I';
		case 2:
			buffer[pos++] = 'I';
		case 1:
			buffer[pos++] = 'I';
			break;
		case 4: buffer[pos++] = 'V';
		buffer[pos++] = 'I';
		break;
		case 5: buffer[pos++] = 'V'; break;
		case 6:buffer[pos++] = 'I';buffer[pos++] = 'V';  break;
		case 7:buffer[pos++] = 'I';buffer[pos++] = 'I';buffer[pos++] = 'V';  break;
		case 8:buffer[pos++] = 'I';buffer[pos++] = 'I';buffer[pos++] = 'I';buffer[pos++] = 'V';  break;
		case 9:buffer[pos++] = 'I';buffer[pos++] = 'X';  break;
	}
	if (!n)
		buffer[pos] = 'O';
	switch (rady[1])
	{
		case 3:
			buffer[pos++] = 'X';
		case 2:
			buffer[pos++] = 'X';
		case 1:
			buffer[pos++] = 'X';
			break;
			case 4: buffer[pos++] = 'L';
			buffer[pos++] = 'X';
			break;
			case 5: buffer[pos++] = 'L'; break;
			case 6:buffer[pos++] = 'X';buffer[pos++] = 'L';  break;
			case 7:buffer[pos++] = 'X';buffer[pos++] = 'X';buffer[pos++] = 'L';  break;
			case 8:buffer[pos++] = 'X';buffer[pos++] = 'X';buffer[pos++] = 'X';buffer[pos++] = 'L';  break;
			case 9:buffer[pos++] = 'X';buffer[pos++] = 'C';  break;
	}
	switch (rady[2])
	{
		case 3:
			buffer[pos++] = 'C';
		case 2:
			buffer[pos++] = 'C';
		case 1:
			buffer[pos++] = 'C';
			break;
			case 4: buffer[pos++] = 'D';
			buffer[pos++] = 'C';
			break;
			case 5: buffer[pos++] = 'D'; break;
			case 6:buffer[pos++] = 'C';buffer[pos++] = 'D';  break;
			case 7:buffer[pos++] = 'C';buffer[pos++] = 'C';buffer[pos++] = 'D';  break;
			case 8:buffer[pos++] = 'C';buffer[pos++] = 'C';buffer[pos++] = 'C';buffer[pos++] = 'D';  break;
			case 9:buffer[pos++] = 'C';buffer[pos++] = 'M';  break;
	}

	for (i = 0; i < rady[3]; i++)
	buffer[pos++] = 'M';
	char res[EXPRL+1];
	for (i = 0 ; i <pos; i++)
		res[i] =buffer[pos-1-i] ;
	res[pos]=0;
	printf("%s", res);
}

int main()
{
	char e[EXPRL + 1];
	while (scanf("%s", e) != EOF)
	{
		if (strcmp(e, "QUIT") == 0)
		{
			printf("Bye");
			return 0;
		}
		else if (strcmp(e, "RESET") == 0)
		{
			int i = 0;
			for (; i < 10; i++)
				memUsed[i] = 0;
			printf("Ready\n");
			
		}
		else
		{
			
			int i;
			int reg = e[0] - '0';
			state cs = und;
			int num = 0;
			int error = 0;
			int sign = 1;
			
			int nbuf;
			
			for (i = 2; e[i]; i++)
			{
				if (cs == und)
				{
					if (isdigit(e[i]))
					{
						if (!memUsed[e[i] - '0'])
						{
							printf("Error\n");
							error = 1;
							cs = und;
							break;
						}
						num += sign * mem[e[i] - '0'];
					}
					else if (e[i] == '-' || e[i] == '+')
					{
						sign = (e[i] == '-' ? -1 : 1);
					}
					else
					{
						cs = rn;
						nbuf = 0;
						i--;
						continue;
					}
				}
				else if (cs == rn)
				{
					/*if (e[i] == letters[rad])
						nbuf += values[rad];
					else if ((srad = issmaller(rad, e[i])) && e[i+1] == letters[rad])
						nbuf += values[rad] - values[srad-1];
					else
					{
						rad--;
						i--;
						if (rad < 0)
						{
							cs = und;
							num += sign * nbuf;
						}
						continue;
					}*/
 					if (isgreater(e[i], e[i+1]))
						nbuf -= getvalue(e[i]);
					else
						nbuf += getvalue(e[i]);
					if (!isdigit(e[i+1]))
					{
						cs = und;
						num += sign * nbuf;
					}
				}
			}
			if (!error)
			{
				mem[reg] = num;
				memUsed[reg] = 1;
				if (num < 0 || num > 10000)
					printf("Error\n");
				else
				{
				printf("%d=", reg);
				toRoman(num);
				printf("\n");
				}
			}
		}
		scanf("\n");
	}
	return 0;
}