def read_roman(s): table = {'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'D': 500, 'M': 1000, 'IV': 4, 'IX': 9, 'XL': 40, 'XC': 90, 'CD': 400, 'CM': 900} num = 0 while s: for c in sorted(table)[::-1]: if s.startswith(c): num += table[c] s = s[len(c):] break return num def print_roman(num): table = {1: 'I', 5: 'V', 10: 'X', 50: 'L', 100: 'C', 500: 'D', 1000: 'M', 4: 'IV', 9: 'IX', 40: 'XL', 90: 'XC', 400: 'CD', 900: 'CM'} s = "" while num: for n in sorted(table)[::-1]: if num >= n: num -= n s += table[n] break print(s) n = int(input()) ans = 0 for r in input().split(' '): ans += read_roman(r) print(ans) if ans < 4000: print_roman(ans) else: print("ERROR")