/*
 * 開始 2005/11/11 20:38 
 */

import java.util.Scanner;

public class _05C {

	public static int conv(String s) {
		
		int ans = 0, tmp = 1;
		char[] ch = s.toCharArray();
		for(int i = 0; i < ch.length; i++) {
			if(ch[i] == 'm') {
				ans += tmp * 1000;
				tmp = 1;
			}
			else if(ch[i] == 'c') {
				ans += tmp * 100;
				tmp = 1;
			}
			else if(ch[i] == 'x') {
				ans += tmp * 10;
				tmp = 1;
			}
			else if(ch[i] == 'i') {
				ans += tmp * 1;
				tmp = 1;
			}
			else {
				tmp = ch[i] - '0';
			}
		}
		
		return ans;
	}
	
	public static String reconv(int n) {
		String ans = "";
		
		char[] ch={'i', 'x', 'c', 'm'};
		int index = 0;
		while(n > 0) {
			int tmp = n % 10;
			if(tmp > 1) {
				ans = Integer.toString(tmp) + ch[index] + ans;
			}
			else if(tmp == 1) {
				ans = ch[index] + ans;
			}
			n /= 10;
			index++;
		}

		return ans;
	}
	
	public static void main(String[] args) {
		
		int loop;
		Scanner sc = new Scanner(System.in);
		loop = sc.nextInt();
		while(loop-- != 0) {
			
			String str1 = sc.next();
			String str2 = sc.next();
			
			System.out.println(reconv(conv(str1) + conv(str2)));
		}
	}
}

/*
 * 終了 2005/11/11 21:00
 * 
 * 答えが出たー。と思ったらreconv()も要ることに気づく。
 * Outputくらいはよく見ましょうね！
 * 
 */