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

int reg[11];
char cast[10001];
char rimske[10001];

int is_num(char *pismeno) {
  return (pismeno[0] > '0' && pismeno[0] <= '9' ? 1 : 0);
}

void frimske(int num) {
  int pos = 0;
  while(1) {
    if (!num) break;
    if (num-1000 >= 0) {
      rimske[pos++] = 'M';
      num -= 1000;
      continue;
    }
    if (num / 100 == 9) {
      rimske[pos++] = 'C';
      rimske[pos++] = 'M';
      num -= 900;
      continue;
    }
    if (num-500 >= 0) {
      rimske[pos++] = 'D';
      num -= 500;
      continue;
    }
    if (num / 100 == 4) {
      rimske[pos++] = 'C';
      rimske[pos++] = 'D';
      num -= 400;
      continue;
    }
    if (num-100 >= 0) {
      rimske[pos++] = 'C';
      num -= 100;
      continue;
    }
    if (num / 90 == 1) {
      rimske[pos++] = 'X';
      rimske[pos++] = 'C';
      num -= 90;
      continue;
    }
    if (num-50 >= 0) {
      rimske[pos++] = 'L';
      num -= 50;
      continue;
    }
    if (num / 40 == 1) {
      rimske[pos++] = 'X';
      rimske[pos++] = 'L';
      num -= 40;
      continue;
    }
    if (num-10 >= 0) {
      rimske[pos++] = 'X';
      num -= 10;
      continue;
    }
    if (num / 9 == 1) {
      rimske[pos++] = 'I';
      rimske[pos++] = 'X';
      num -= 9;
      continue;
    }
    if (num-5 >= 0) {
      rimske[pos++] = 'V';
      num -= 5;
      continue;
    }
    if (num / 4 == 1) {
      rimske[pos++] = 'I';
      rimske[pos++] = 'V';
      num -= 4;
      continue;
    }
    if (num-1 >= 0) {
      rimske[pos++] = 'I';
      num -= 1;
      continue;
    }
  }

  if (!pos) rimske[pos++] = 'O';
  rimske[pos] = '\0';
}

int to_num(char *ch) {
  int num = 0;
  int length = strlen(ch);
  int i;
  for (i = 0; i < length; i++) {
    int exc = 0;
    if (i+1 <= length) {
      if (ch[i] == 'I' && ch[i+1] == 'V') exc = 4;
      if (ch[i] == 'I' && ch[i+1] == 'X') exc = 9;
      if (ch[i] == 'X' && ch[i+1] == 'L') exc = 40;
      if (ch[i] == 'X' && ch[i+1] == 'C') exc = 90;
      if (ch[i] == 'C' && ch[i+1] == 'D') exc = 400;
      if (ch[i] == 'C' && ch[i+1] == 'M') exc = 900;
    }
    if (exc > 0) {
      num += exc;
      if (length > i+1) i++;
      continue;
    } else {
      if (ch[i] == 'O') exc = 0;
      if (ch[i] == 'I') exc = 1;
      if (ch[i] == 'V') exc = 5;
      if (ch[i] == 'X') exc = 10;
      if (ch[i] == 'L') exc = 50;
      if (ch[i] == 'C') exc = 100;
      if (ch[i] == 'D') exc = 500;
      if (ch[i] == 'M') exc = 1000;
      num += exc;     
    }
  }

  /*  printf("%s -> %d\n", ch, num);*/
  return num;
}

int main() {
  char line[10001];
  int i;
  int znamenka[10001];
  for (i = 0; i < 11; i++) reg[i] = -1;
  while (1) {
    gets(line);    
    if (strcmp(line, "QUIT") == 0) {
      printf("Bye\n");
      break;
    }
    if (strcmp(line, "RESET") == 0) {
      for (i = 0; i < 11; i++) reg[i] = -1;
      printf("Ready\n");
      continue;
    }
    int r;
    char tok[10001];
    char *ptok = tok;
    strcpy(tok, strtok(line, "="));
    r = atoi(tok);
    strcpy(line, strtok(NULL, "="));
    /*    printf("%s\n", line);*/

    int tmp = strlen(line);
    int citac = 0;
    if (line[0] == '+') {
      znamenka[citac++] = 1;
    } else if (line[0] == '-') {
      znamenka[citac++] = 0;
    } else {
      znamenka[citac++] = 1;
    }
    for (i = 1; i < tmp; i++) {
      if (line[i] == '+') znamenka[citac++] = 1;
      if (line[i] == '-') znamenka[citac++] = 0;
    }

    int result = 0;
    ptok = strtok(line, "+-");
  /*    printf("%s\n", ptok);*/
    if (is_num(ptok)) {
      if (reg[atoi(ptok)] == -1) {
	printf("Error\n");
	continue;
      }
      if (znamenka[0]) {
	result += reg[atoi(ptok)];
      } else {
	result -= reg[atoi(ptok)];
      }
    } else {
      if (znamenka[0]) {
	result += to_num(ptok);
      } else {
	result -= to_num(ptok);
      }
    }

    int pos = 1;
    while ((ptok = strtok(NULL, "+-")) != NULL) {
      /*      printf("%s %d\n", ptok, is_num(ptok));*/
      if (is_num(ptok)) {
	if (reg[atoi(ptok)] == -1) {
	  printf("Error\n");
	  break;
	}
	if (znamenka[pos++]) {
	  result += reg[atoi(ptok)];
	} else {
	  result -= reg[atoi(ptok)];
	}
      } else {
	if (znamenka[pos++]) {
	  result += to_num(ptok);
	} else {
	  result -= to_num(ptok);
	}
      }
    }    
    if (result < 0 || result > 10000) {
      printf("Error\n");
      continue;
    }
    frimske(result);
    printf("%d=%s\n", r, rimske);
    reg[r] = result;
  }
  
  return 0;
}